Rock Practice Test 12 to 26

12. Igneous intrusive rocks...

1. have a coarse texture and formed from lava cooling quickly at the Earth’s surface.

2. have a grain size of 1mm or larger and cooled deep within the Earth.

3. have a glassy texture and cooled quickly.

4. are always mafic and dark in color.

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13. Which of the following minerals is commonly used as a source of building stones?

1. Quartz

2. Muscovite Mica

3. Hematite

4. Dolomite

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A student collects several cobble size rock samples for an Earth Science

project. The first sample reacts in acid and contains visible fragments of

shells. The rock is...

1. conglomerate 2. marble 3. limestone 4. rock salt

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Fossils are rarely found in...

1. igneous and metamorphic rocks.

2. organic sedimentary rocks.

3. clastic sedimentary rocks.

4. non-clastic sedimentary rocks.

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Which phrase best describes the formation of metamorphic rocks.

1. A rock which forms from the compaction of plant and animal remains.

2. A rock which forms from the melting and solidification of rocks.

3. A rock which forms when existing rocks are exposed to intense

heat and/or pressure without melting.

4. A rock which forms from crystals from chemical precipitates and

evaporites.

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Which rock is formed from the metamorphism of quartz sandstone?

1. slate 2. quartzite 3. marble 4. siltstone

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The picture represents a coarse grain rock which has undergone high-grade metamorphism.

What is the name of this rock?

• Slate

• Phyllite

• Gabbro

• Gneiss

Why must fossil fuels be conserved and used wisely?

1. They are widely distributed throughout the world and have many uses.

2. They are very dangerous and need great care when used.

3. They are renewable resources which can be easily produced and distributed.

4. They are non-renewable resources which have a limited supply.

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. How do chemical sedimentary rocks form?

1. They form from heat and pressure on existing rocks.

2. They form from the evaporation of ocean water.

3. They form from the cooling of magma deep below the Earth’s surface.

4. The form from the compaction and cementation of rock particles

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. Which of the following statements best describes why a single parent rock

may form several different metamorphic rocks?

1. All rocks are made of the same minerals.

2. The arrangement of the atoms vary between similar rocks.

3. The type and degree of metamorphism determines which rock is formed.

4. The rate of cooling determines which metamorphic rock is formed.

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