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CA Earth Science-Rocks and Minerals
Rocks and Minerals
44
Science
6th Grade
10/19/2009

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Term
Natural
Solid
Inorganic
Crystals
Definition
Defining characteristics of minerals
Term
Crystals
Definition
regular, repeating arrangment of atoms in the solid state
Term
Formed from solution when liquid evaporates
Forms as crystallization occurs within a liquid
Forms as liquid rocks cools and solififies
Definition
How minerals can form
Term
eight (8)
Definition
The over 4000 minerals on Earth are primarily composed of ___ elements
Term
oxygen and silicon
Definition
two most common elements found in minerals
Term
Silicates
Definition
Minerals made up of silicon and oxygen
Term
Appearance
Streak
Hardness
Cleavage/Fracture
Luster
Special features such as magnetism, ability to refract light
Definition
Ways in which minerals are identified
Term
Gems
Definition
rare and beautiful minerals
Term
Ore
Definition
Materials that can be mined from the ground and minerals can be removed and sold at a profit
Term
slowly
Definition
Large crystals are formed as magma cools _____.
Term
quickly
Definition
Small cyrstals form when magma cools ____.
Term
Rock cyle
Definition
Shows the processes involved in the the formation and changing of rocks
Term
weathering and erosion
Definition
processes that turn rock into sediments
Term
compaction and cementation
Definition
processes that change sediments into rock
Term
Igneous
Definition
rock that forms from the cooling of magma
Term
Sedimentary
Definition
rocks that form fromm sediments
Term
Metamorphic
Definition
rocks that form from other rocks that undergo changes
Term
Heat and pressure
Definition
Processes that change one type of rock into other rocks without melting it
Term
Magma
Definition
molten rock within Earth
Term
Lava
Definition
Magma that reaches Earth's surface
Term
less dense
Definition
Magma rises because it is ____ than the surrounding rock.
Term
Foliated and nonfoliated
Definition
Metamorphic rocks are classified according to their banding as __ or ___.
Term
Foliated
Definition
Banded metamorphic rock
Term
Nonfoliated
Definition
Unbanded metamorphic rock
Term
Intrusive
Definition
Igneous rocks that form below Earth's surface
Term
Extrusive
Definition
Igneous rocks that form at or near Earth's surface
Term
Sedimentary
Definition
type of rock almost always formed at or near Earth's surface
Term
Rock
Definition
a combination of sediments, chemicals, mineral crystals and/or inorganic materials
Term
Detrital
Chemical
Organic
Definition
Three types of sedimentary rocks
Term
Detrital
Definition
sedimentary rocks made from rock fragments
Term
Organic
Definition
Sedimentary rocks composed of plant or animals materials
Term
light-colored
lower density than basaltic
high silica content
Definition
Granitic rocks
Term
Dark-colored
high density
low silica content
Definition
Basaltic rocks
Term
Andsitic
Definition
Type of magma that has a composition between basaltic and granitic
Term
Streak
Definition
colored of powdered mineral
Term
hardness
Definition
measure of how easily a mineral can be scratched
Term
Mohs
Definition
Scale used to determine the hardeness of a mineral
Term
Cleavage
Definition
describes the tendency of a mineral to break along straight smooth surfaces
Term
Fracture
Definition
describes minerals that break along rough, jagged edges
Term
Luster
Definition
describes how light reflects from a mineral
Term
Compaction
Definition
the process where sediments are pressed together to form rock
Term
Cementation
Definition
process where sediments are glued together by minerals to form rock
Term
Sediments
Definition
rock fragments
Term
Igneous
Definition
most common types of rocks on Earth
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