Layers of the Earth
What are the two types of crust that make up the Earth's outermost layer?
continental and oceanic
What do plate tectonics explain?
How parts of Earth's surface were formed.
What are the three main types of rock?
sedimentary, igneous, metamorphic
Where do metamorphic rocks typically form?
Deep in the planet's crust
This uses a drawing and labels to explain something.
diagram
About how long ago did the Earth form?
4.6 billion years ago.
Scientists believe that about how many plates make up the earth's crust?
30
What are the three different types of sedimentary rocks?
clastic, organic, chemical
What are two main categories of igneous rocks?
extrusive and intrusive
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index
Where is most of the Earth's volume?
in the mantle
What was the name of the one big continent?
Pangaea
What does erosion do?
it removes fragments from their source and transports them to a new location
Igneous rocks can have many different compositions depending on what?
The magma they cool from.
This gives the meaning of important words.
Is the outer core liquid or solid?
liquid
What was the name of the one big ocean?
Panthalassa
What is foliation?
the aligning of elongated or platy minerals perpendicular to the direction of pressure that is applied.
What are two categories of sedimentary rock?
detrital and chemical
This shows where places are located
map
What drives plate movement on Earth's surface?
a constant heating and cooling cycle in the mantle.
When did Pangaea break into two huge continents?
About 200 million years ago.
What latin word does Igneous come from?
the latin word for fire
Where are sedimentary rocks formed?
Near or on the Earth's surface.
Explains a picture or photograph
caption