Rocks and Rock Cycle Test (G)

Magma is an underground mix of molten rock, gases, and minerals

• True

• False

The continuous changing and reforming of rocks is called graded bedding

• True

• False

Intrusive igneous rocks form ____.

• Fine (small minerals)-grained rocks

• when a molten mass of rocks cools quickly

• on Earth's surface

• Coarse (large minerals)-grained rocks

Rocks are formed when magma ____.

• Cements and Compacts

• undergoes radioactive decay

• cools and crystallizes

• Weathers and erodes

Igneous rocks that cool slowly beneath Earth’s crust are ____.

• extrusive

• intrusive

• sedimentary

• always magnetic

An example of an Igneous rocks that cool quickly on Earth’s surface is ____.

• Granite

• Gabbro

• Obsidian

• Diorite

Extrusive rocks, which cool more rapidly than intrusive rocks, are generally more ____.

• coarsely grained

• finely grained

• radioactive

• magnetic

The cooling and hardening of magma deep underground results in rocks classified as

• plutonic

• volcanic

• sedimentary

• metamorphic

An example of a plutonic rock is

• Pumice

• Granite

• Obsidian

• Scoria

A lava flow cools and solidifies. Which of these rocks probably formed?

• Conglomerate

• Limestone

• Shale

• Basalt