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science stuffs
earth science help for midterms
160
Science
7th Grade
12/14/2006

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Term
process of forming clastic sedimentary rocks
Definition
weathering, deposition, compaction, cementation
Term
most likely source rock for conglomerate that contains alot of quartz sand and some clay
Definition
granite
Term
silica shells of tiny microorganisims form :
Definition
chert
Term
pea sized rock (clast size)
Definition
gravel
Term
where are the oldest layers of sediments
Definition
bottom (the deeper the older)
Term
mafic magma tends:
Definition
to be high in plagioclase w/ no quartz
Term
minerals rich in calcium, iron, magnesium are
Definition
dark in color
Term
when igneous rock is weathered and eroded it forms
Definition
sediments
Term
if sedimentary rock is melted into lava and cooled it will form
Definition
igneous rock
Term
oganic rocks tend to
Definition
burn easily
Term
2 clasts that are the most easy to cement
Definition
silt and clay
Term
regional metamorphism is influenced by
Definition
temperature, pressure, gases and liquids in the rock
Term
shale was formed
Definition
in calm water conditions (because particles were so small)
Term
stratification
Definition
layers of sediments
Term
3 minerals that cement
Definition
calcium, silica, iron
Term
marble would be a bad countertop because
Definition
the acid would melt it away
Term
limestone can form from
Definition
a liquid
Term
horizantal intrusion of cooled magma
Definition
sill
Term
vertical intrusion of cooled magma
Definition
dike
Term
largest pluton
Definition
batholith
Term
large mass of cooled magma underground
Definition
pluton
Term
intrusive
Definition
underground
Term
extrusive
Definition
above ground
Term
sedimentary rocks form in
Definition
layers
Term
why is coal a better fuel than peat?
Definition
coal is more compacted, more fuel per inch
Term
as air pressure increases, mercury in a barometer
Definition
rises
Term
millibars
Definition
measure of air pressure
Term
further up in the atmospher, the air pressure
Definition
decreases
Term
when air rises up the side of a mountain
Definition
the temp decreases and the relative humidity increases
Term
any form of water that falls from a cloud is
Definition
precipitation
Term
difference between sleet and hail is
Definition
where the ice pellets form
Term
to produce precip. clouds are seeded w/
Definition
dry ice and silver iodide
Term
smallest water particles in precip
Definition
drizzle
Term
weather vane
Definition
measures wind direction
Term
thermometer
Definition
measures temperature
Term
rain gauge
Definition
measures rainfall
Term
meter stick
Definition
measures snowfall
Term
anemometer
Definition
measures wind speed
Term
wet bulb & dry bulb psychrometer
Definition
measure relative humidity
Term
barometer
Definition
measures air pressure
Term
wind blows out TO sea
Definition
during the night
Term
coriolis effect (northern hemisphere) causes fast moving objects that travel over great distances to
Definition
turn right
Term
jet stream can move very fast b/c
Definition
it is high in the troposhpere
Term
zone where doldrums lie and where winds converge
Definition
the ITCZ
Term
differences in air temperature and air pressure causes
Definition
wind
Term
doldrums and horse latitudes have in common:
Definition
barely any wind
Term
winds that lie between the doldrums and horse latitudes
Definition
trade winds
Term
three cell model weakness
Definition
assuming that the world is flat
Term
strength of the three cell model
Definition
shows us (approx) where certain wind patterns are
Term
in general, winds blow out of ____ and into ____
Definition
lows, highs
Term
strongest winds (isobar)
Definition
where the isobars are closest together
Term
bernoulli effect
Definition
fast moving air is lower pressure
Term
nimbostratus clous look like
Definition
dark, flat, kind of like a blanket
Term
___ contains most of the weather
Definition
troposphere
Term
earths atmospher is important because
Definition
it provides all the gases that living things need
Term
atmosphere traps some of the energy from the sun which alows water
Definition
to exist as a liquid
Term
most abundant gases in atmosphere
Definition
O2 and N2 (oxygen and nitrogen)
Term
other gases (besides the ones that are most abundant) in atmospher are (percent)
Definition
1%
Term
humidity is ___ in the form of ___
Definition
water, gas
Term
most pollution comes from
Definition
burning fossil fuels
Term
farther up in tyhe atmopher, the ___ the air pressure
Definition
lower
Term
when climbing a mountain, you get out of breath easily because
Definition
the density of oxygen decreases
Term
mail layers of the atmosphere are classified by
Definition
temperature
Term
from earth to space, the main layers of the atmosphere are:
Definition
troposphere, stratosphere, mesosphere, thermosphere
Term
insolation
Definition
how much of the sun's energy hits a certain area of the earth
Term
wat causes convection to occur?
Definition
different densities of materials
Term
why does the temperature of a wet bulb thermometer go down compared to a dry bulb?
Definition
as the water evaporates, it absorbs heat
Term
a hole in the ozone layer would most likely have which major effect on humans?
Definition
an increase in skin cancers
Term
greenhouse effect:
Definition
the process in which gases hold heat in the atmosphere
Term
what causes the formation of clouds?
Definition
rising air cools and the air can't hold the water vapor as well so it condenses
Term
how come it gets warmer when it snows?
Definition
when water freezes, it releases heat
Term
temperature inversions
Definition
when warm air forms a blanket over cold air and traps it, smog can build up (big problem in LA)
Term
nearly all the heat from a campfire reaches you by
Definition
radiation
Term
best explains why houston is warmer than alaska?
Definition
houston get more direct sunlight
Term
accuracy:
Definition
having a low percentage of error
Term
chemical formula for ozone:
Definition
O3
Term
CO2=
Definition
carbon dioxide
Term
ph scale
Definition
0-14 measures acidity
Term
heat index
Definition
wat the temp feels like (can be lower or higher than the real temp)
Term
on a day w/ a high dew point would the difference on a dry bul/wet bulb thermometer be big or small?
Definition
small
Term
nitrogen and sulfur oxides combine with water to create
Definition
acid rain
Term
this gas contributes most to global warming
Definition
CO2
Term
isotherms
Definition
lines on a weather map that connect places with the same temperature
Term
the amount of cm3 that are in 100 mL
Definition
100
Term
wat is the dew point
Definition
the temperature at which water vapor condenses
Term
why is knowing the dew point useful?
Definition
depending on the dew point, the temperature may feel hotter than it really is (the higher the relaive humidity the harder it is for your sweat to evaporate)
Term
heat vs. temperature
Definition
temperature=the measure of the average kinetic energy the molecules have, and heat is the total kinetic energy
Term
air mass formed over northern mexico and affected the southwestern US would be
Definition
continental tropical air mass
Term
warm air masses that affect the gulf are called
Definition
maritime tropical air mass
Term
cold, dry air affecting northern US in the winter
Definition
continental polar air mass
Term
when a rapidly moving air mass catches up with a slow moving air mass
Definition
occluded front
Term
when a warm air mass and a cold air mass collide and have a "standoff" the result is
Definition
a stationary front
Term
thunderstorms form within
Definition
large cumulonimbus clouds
Term
lightning
Definition
a stream of electrons through the sky
Term
if doppler radar wave is sent out toward a storm and it returns back w/ shorter waves, then
Definition
the storm is coming towards you
Term
how clear the skies are would have the greatest effect on the ___ index
Definition
UV
Term
the updraft in a thunderstorm can produce
Definition
hail, tornadoes, charged droplets and lightning, low air pressure
Term
when we see the jet stream converge it is likely that a _____ will form
Definition
high
Term
in the USA the jet stream is often at the border of which 2 air masses
Definition
maritime tropical and continental polar
Term
the slower the hurricane, the more likely there will be
Definition
more rain in a given area
Term
saffir-simpson scale is based on
Definition
how fast the wind is blowing in a hurricane
Term
blizzard
Definition
snowstorm in which visibilty is very poor, it gets really cold, the wind is blowing hard
Term
some hurricane names get removed from the list because
Definition
the storms were so damaging it would be insensitive to use them again
Term
the strongest winds in a hurricane are located
Definition
in the eyewall
Term
hurricane season
Definition
june to november
Term
y is there a storm surge in the eye of a hurricane?
Definition
the air pressure in the eye is very low
Term
the shallower the shelf the ____ the storm surge
Definition
bigger
Term
there are ___ hurricanes during El NiƱo years
Definition
less
Term
meteorology
Definition
study of weather
Term
why dont hurricanes form close to the equator?
Definition
lack of sufficient coriolis effect
Term
hurricanes' role in nature:
Definition
to tranfer heat in the ocean to colder places up north
Term
low pressure systems in tthe USA spin
Definition
counterclockwise
Term
giant thunderstorms w/ very strong updrafts are called
Definition
supercells
Term
if an updraft in a thunderstorm start rotating it can form a
Definition
tornado
Term
why is water the fuel of a hurricane?
Definition
when the warm water vapor rises it cools and condenses, it releases heat, and heat powers the hurricane
Term
how lightning is formed:
Definition
when water droplets bounce around within a cloud, the bigger ones take away the negative charges from the smaller ones, the bigger negatively charged ones settle towards the bottom of the cloud, then they begin to attract the positive charges from thew gound/in another cloud/in the cloud itself. this creates a discharge of electricity that we calll electricty.
Term
why does convection occur
Definition
the colder water/air is more dense so it sinks to the bottom and the less dense water/air which is warmer rises
Term
where is insolation greatest?
Definition
near the equator
Term
2 human activities that cause concentration of CO2 in atmosphere
Definition
burning fossil fuels, deforestation
Term
what does the ozone layer do to help us
Definition
reflects UV rays
Term
only method of heat transfer thru outer space
Definition
radiation
Term
a ____ night should cool off more
Definition
clear
Term
earth is divided into 24 ______ each 15 degrees wide
Definition
timezones
Term
the apparant shift in the position of nearby stars when compared to distant stars it called
Definition
parralax
Term
which layer of earth lies between the crust and outer core
Definition
mantle
Term
the earth is tilted on a ____ degree axis
Definition
23.5
Term
hypothesis that explains how the earth was formed from a spinning cloud
Definition
nebular hypothesis
Term
where is the earth hottest?
Definition
inner core
Term
shortest day of the year
Definition
winter solstice
Term
0 degree longitude line that runs thru Greenwich england
Definition
prime meridian
Term
what causes seasons
Definition
earth's tilt
Term
element in the earths core that is most reponsible for magnetic field
Definition
iron
Term
powerful reaction= join together and release energy
Definition
fusion
Term
geology
Definition
study of the earth
Term
molecule
Definition
2 or more atoms linked together by covalent bonds
Term
nonmetal
Definition
elements to the right of the zigzag line on the periodic table
Term
luster
Definition
a mineral property describing the appearance of light reflected from it
Term
proton
Definition
a positively charged subatomic particle
Term
isotope
Definition
atoms of an element that have different masses
Term
mineral
Definition
a natural, inorganic solid with a crystal structure
Term
compound
Definition
2 or more different elements bonded
Term
weight
Definition
the effect of gravity on a mass
Term
covalent bond
Definition
bond where atoms share electrons
Term
iridescense
Definition
when a mineral reflects light in a rainbow-like manner
Term
Moh's scale
Definition
how we classify the hardness of a mineral
Term
cleavage
Definition
a mineral splitting along a plane of it's crystal structure
Term
flourescence
Definition
when a mineral emits light while being exposed to radiation
Term
which subatomic particle determines the behavior of an atom
Definition
electrons
Term
why is the mass listed in decimal value?
Definition
because it is an average of all of the element's isotopes
Term
all matter must have _____ and ______
Definition
volume, mass
Term
which 2 subatomic particles are in the nucleus
Definition
protons and nuetrons
Term
which is lighter, dry or humid air?
Definition
humid
Term
isobars are lines of _______ on a map
Definition
the same air pressure
Term
hurricanes in the northern hemisphere tend to spin
Definition
counterclockwise
Term
squall line
Definition
thunderstorms and winds that precede a front
Term
Saffir-Simpson scale
Definition
measure the intensity of hurricanes
Term
hurricane
Definition
a huge low pressure storm that spins counterclockwise in the north
Term
TORNADO
Definition
a violently rotating wind that is the product of a supercell
Term
thunderstorm
Definition
often include thunder, lightning, rain, hail
Term
supercell
Definition
enormous thunderstorms with very strong updrafts and winds
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