Rocks

Iron-containing minerals in rocks may combine with water and air to create rust. What is this an example of?

• Chemical weathering

• physical weathering

• abrasion

• pollution

Which statement can be true for a rock?

• a rock is a type of mineral

• a rock may contain no minerals

• a rock is always made of at least one mineral

• a rock is always made of two or more minerals

The most common type of rock at Earth's surface.

• igneous

• metamorphic

• sedimentary

• plant-based

A metamorphic rock melts and, then over time, it cools and becomes a solid. These processes are part of the*

• magma cycle

• pressure cycle

• water cycle

• rock cycle

Coal is made of the remain of ancient*

• plants

• shells

• rocks

• minerals

The rock cycle *

• ends with igneous rocks

• begins with igneous rocks

• ends with metamorphic rocks

• has no beginning or end

Rocks are different from minerals because rocks *

• can be used by humans

• are naturally formed solids

• may not have a mineral structure

• can re-crystallize into other types of rocks

What kind of rock forms as magma cools inside the Earth?

• extrusive igneous

• intrusive igneous

• metamorphic

• sedimentary

Which is important in determining the size of minerals crystals in igneous rock?

• the original temperature of the magma

• the speed at which the magma cools

• the amount of silica in the magma

• the composition/makeup of the magma

A dark colored igneous rock is most likely to be *

• found near Earth's surface

• formed under high pressure

• low in silica

• high in silica