Rock Cycle
500 points
500
100 points
100
What are the three main rock types?
Igneous, metamorphic and sedimentary
granite?
a very hard grey rock used for building
limestone?
type of rock that contains calcium
explain how igneous rock form.
it forms when molten rock cools and becomes solid
how many percent of earth's crust consists of igneous and metamorphic rock?
What is Ship Rock an example of?
An intrusive igneous rock feature
how does silica affect lava?
the amount of silica in lava affects the speed at which lava flows
crust?
hard outer layer of the earth
what sentence is an example from the passage that shows how people used rocks to build structures?
the faces of four U.S. presidents are carved in granite of mount rush more.
how much of time does it typically take for rocks to change?
thousands to millions of years.
How could an igneous rock become a sedimentary rock?
If intrusive igneous - Uplifted, eroded and weathered, sediment transported and deposited, compressed by layers to form rock
If extrusive - eroded and weathered, sediment transported and deposited, compressed by layers to form rock
explain what ids true of an igneous rock that is light in color.
it has a high level of silica in its composition
how does landforms made from intrusive igneous rocks usually long-lasting?
intrusive igneous rocks are harder than the other surrounding rocks.
minerals have an orderly crystal structure
what can be found between earth's thin surface layer and earth's metallic core?
solid and molten rock
Why do intrusive igneous landforms tend to be long-lasting landforms?
They are harder than the other surronding rock
how is the texture of an igneous rock determined?
how quickly magma or lava cools to form it
what is true of extrusive igneous rock?
it has very small mineral crystals
what is true about limestone?
it can be composed entirely of calcite
what makes obsidian similar to coal?
neither is composed of minerals
Why are sedimentary rocks only commonly found at the surface?
The processes which make sedimentary rocks only occur at the surface
what is the difference between magma and lava?
magma does not reach earth's surface, but lava does
explain what causes intrusive igneous rocks to form?
magma cools within earth.