3 Types of Rock

Which of these is NOT among the three main groups of rock?

• igneous

• sedimentary

• metamorphic

• lithic

Rocks are composed of particles that contain various

combinations of such common elements as

• oxygen, silicon, aluminum, iron, and calcium

• argon, krypton, xenon, and the radioactive radon

• neodymium, promethium, terbium, scandium, and cerium

• gold, frankincense, myrrh, and unobtainium

Granite is an example of a(n)

• intrusive igneous rock

• extrusive igneous rock

• organic metamorphic rock

• inorganic metamorphic rock

The rock has large crystals. This is probably because

• the rock cooled slowly beneath the Earth's surface

• the rock cooled quickly above the Earth's surface

• the rock was composed of organic matter

• the rock fell to Earth from space

Fossils are most likely to be found in

• sedimentary rocks

• igneous rocks

• metamorphic rocks

• lithic

Sedimentary rocks evolve under water in horizontal beds

called

• strata

• teff

• lager

• kerogen

With large and rounded particles — for example, the size and shape of gravel — a gravelly sedimentary rock called conglomerate forms.

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Sedimentary rocks also derive from organic material, such as coral, shells, and marine skeletons. These materials settle into beds in shallow seas, forming

• limestone

• granite

• basalt

• pumice

If the organic material forms mainly from decomposing vegetation, it can develop into a sedimentary rock called

• bituminous coal

• basalt

• sandstone

• granite

These rocks are formed from igneous and sedimentary rocks by Earth’s forces that generate heat, pressure, or chemical reaction.

• metamorphic

• transmogrific

• lithomorphic

• transnistria