Earth's Structures Review

Front

What is limestone?

Back

Limestone is a sedimentary rock formed from the accumulation of marine organisms' shells and skeletons.

Front

What process transforms limestone into marble?

Back

The transformation of limestone into marble occurs through heat and pressure during the rock cycle.

Front

What type of rock is formed from smaller pieces of rock settling at the bottom of a lake?

Back

Sedimentary rock.

Front

Which layer of the Earth is liquid (molten) metal?

Back

The outer core.

Front

What is a rock formed from fragments of other rocks called?

Back

Sedimentary rock.

Front

What happens in a convection current?

Back

Hot less dense rock rises; cool more dense rock sinks.

Front

What are the three main types of rocks?

Back

Igneous, sedimentary, and metamorphic.

Front

How are igneous rocks formed?

Back

Igneous rocks are formed from the cooling and solidification of molten rock (magma or lava).

Front

What is the difference between intrusive and extrusive igneous rocks?

Back

Intrusive igneous rocks form from magma that cools slowly beneath the Earth's surface, while extrusive igneous rocks form from lava that cools quickly on the surface.

Front

What is the rock cycle?

Back

The rock cycle is the continuous process of rock formation, breakdown, and reformation through various geological processes.