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Which of the following characteristics of metamorphic rocks is correct? I. These rocks are denser and harder than the original Protolith. II. These rocks do not contain fossils. III. Conglomerate is a type of metamorphic rock.

Which of the following characteristics of metamorphic rocks is correct? I. These rocks are denser and harder than the original Protolith. II. These rocks do not contain fossils. III. Conglomerate is a type of metamorphic rock. Correct Answer I and II

The correct answer is I and II.

There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks is formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle.

Key Points

  • Metamorphic Rocks
    • Metamorphic rocks are rocks that have been changed from their original form by immense heat or pressure.
    • They are formed when physical and chemical changes occur to igneous, sedimentary, or other metamorphic rocks.
    • Metamorphic rocks are almost always harder than sedimentary rocks.
    • They are generally as hard and sometimes harder than igneous rocks. They form the roots of many mountain chains and are exposed to the surface after the softer outer layers of rocks are eroded away.
    • Metamorphic rocks have two classes: foliated and non-foliated. 
    • Foliated metamorphic rocks: These rocks are produced by exposure to heat and pressure which makes them appear layered. Phyllite and gneiss are examples of foliated metamorphic rocks.
    • Non-foliated metamorphic rocks: These rocks don’t have layers. Marble and quartzite are examples of non-foliated metamorphic rocks.

Additional Information

  •  Igneous rocks are formed from solidified magma or lava. Magma is thought to be generated within the layer of partially molten rock underlying Earth’s crust at a depth below about 60 kilometers (40 miles).
    • Lava is liquid magma on the Earth’s surface, and the solidified rock is formed by cooled lava.
  • Sedimentary rocks are formed from deposited and lithified mineral material.
    • Fossils are generally found in sedimentary rock. Among the three major types of rock, fossils are most commonly found in sedimentary rock.
    • Of the sedimentary rocks, most fossils occur in shale, limestone, and sandstone. Earth contains three types of rocks: metamorphic, igneous, and sedimentary.
    • A conglomerate is a clastic sedimentary rock made up of rounded clasts that are greater than two millimeters in diameter.

Hence, only statements I and II are correct.

Related Questions

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