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Chapter 9 Science
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layers of the earth
crust/solid rock
mantle/liquid and solid
outer core/dense fluid
inner core/made of iron and nickel
crust and upper mantle
lithosphere
the circular movement of heated materials in a cooler area.Heated air rises; cooler air sinks
Convection Currents
the study of how the lithosphere plates interact
plate tectonics
plates interact in three different ways;
convergent boundary ;push together
divergent boundary;pull apart
transform boundary;slip past each other
the process in which rocks are gradually broken down
weathering
breakdown of large rocks to small ones(ex.- ice freezing in the rocks; roots craking the rock apart)
physical weathering
rocks decomposed, dissolved, or loosened
chemical weathering
when oxygen combines with another substance to break down
oxidation
when carbon dioxide dissolves in water
carbonation
no carbon
inorganic
contains carbon
organic
the exposed layer of the earth that contains the most minerals and nutrients
topsoil
the second layer of the earth that contains fewer minerals and nutrients
subsoil
the solid rock layer beneath the subsoil
bedrock
a crack in the earth's crust along which movement occurs
fault
healthy soil
a. color
b. presence of life
c. levels of moisture
d. temparture
e. amount of minerals
f. odor
what two layers of the earth do convection currents occur
outer core and mantle
convection currents occur:
because heated material rises,cools,then sinks back down
Author
fourthgrade
ID
135497
Card Set
Chapter 9 Science
Description
Chapter 9 science review
Updated
2012-02-27T13:24:23Z
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