Metamorphic Rocks

Which rock has never melted, but was produced by great heat and pressure, which distorted and rearranged its minerals?

• siltstone

• breccia

• pegmatite

• metaconglomerate

Which two rocks usually consist of only one mineral, but may contain additional minerals?

• hornfels and diorite

• quartzite and dunite

• rock salt and basalt

• gabbro and bituminous coal

The photograph shows the texture of a rock composed of various minerals as seen through a microscope. Which rock is most likely shown above?

• sandstone

• anthracite coal

• dunite

• schist

The data table lists characteristics of rocks A, B, C, and D. Which rock is most likely phyllite?

• A

• B

• C

• D

The cross section represents a portion of Earth's crust. Letters A through D are locations within the rock units. At which location is quartzite most likely found?

• A

• B

• C

• D

Which rock is only formed by regional metamorphism?

• slate

• hornfels

• dunite

• marble

Wavy bands of light and dark minerals visible in gneiss bedrock probably formed from the

• cementing together of individual miner grains

• cooling and crystallization of magma

• evaporation of an ancient ocean

• heat and pressure during metamorphism

The diagram indicates physical changes that accompany the conversion of shale to gneiss. Which geologic process is occurring to cause this conversion?

• sedimentary layering

• intrusion of magma

• metamorphism

• weathering

The rock shown has a foliated texture and contains the minerals amphibole, quartz, and feldspar arranged in coarse-grained bands. Which rock is shown?

• slate

• dunite

• gneiss

• quartzite

Which physical characteristic best describes the rock phyllite?

• glassy texture with gas pockets

• clastic texture with angular fragments

• bioclastic texture with cemented shell fragments

• foliated texture with microscopic mica crystals