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SCIENCE - LANDFORMS (Lessons 4-8)
5th GRADE SCIENCE
15
Science
5th Grade
03/15/2010

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Term
earthquake
Definition
The sudden vibration of land due to the movement of crustal plates against one another.
Term
focus
Definition
The spot inside the Earth where an earthquake begins
Term
epicenter
Definition
The point on the Earth’s surface that is directly above the focus of an earthquake
Term
igneous rock
Definition
“Fiery rock;” formed as magma cools and becomes hard
Term
metamorphic rock
Definition
Igneous, metamorphic, or sedimentary rock that has been changed into a different kind of rock by extreme heat and pressure
Term
sedimentary rock
Definition
Formed by layers of sediment cemented together over thousands of years
Term
sediment
Definition
Fragments of rock and fossilized remains, created by weathering and carried from one place to another by wind, water, or glacial ice
Term
Richter scale
Definition
A scale based on the numbers one to ten that measures the energy released by an earthquake
Term
rock cycle
Definition
Reoccurring sequence of rocks changing into other kinds of rocks
Term
weathering
Definition
The breaking down of rock by chemical or mechanical means
Term
seismograph
Definition
An instrument to read movement of the land caused by an earthquake
Term
volcano
Definition
A mountain that forms when lava, ashes, rocks, and melted materials pile up and harden
Term
chemical weathering
Definition
Weathering that occurs when the chemical makeup of a rock changes; caused by chemical reactions between minerals in rock, air, and water
Term
erosion
Definition
Process by which weathered material is moved from one place to another by wind, running water, waves, gravity, or glacial ice
Term
physical weathering
Definition
Weathering that occurs when the size and shape of rocks change through changes in temperature, ice, or the growth of plant roots
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