3.3 Exploring Sedimentary Rocks and Fossils

Front

What type of rock is made of tiny fragments of rocks?

Back

SEDIMENTARY

Answer explanation

Sedimentary rocks are formed from the accumulation and compaction of tiny fragments of other rocks, minerals, and organic materials. This distinguishes them from igneous and metamorphic rocks, which form through different processes.

Front

Complete the Sedimentary Rock Cycle: A = ?, B = ?, C = ?

Back

A = Erosion, B = Compaction, C = Cementation

Answer explanation

The correct sequence in the Sedimentary Rock Cycle is A = Erosion, B = Compaction, C = Cementation. Erosion breaks down rocks, compaction compresses sediments, and cementation binds them into solid rock.

Front

Rock made of layers of compressed sediments

Back

sedimentary rock

Answer explanation

Sedimentary rock is formed from layers of compressed sediments. This distinguishes it from metamorphic rock, which is altered by heat and pressure, and igneous rock, which forms from cooled magma or lava.

Front

Fossils are only found in sedimentary rocks.

Back

True

Answer explanation

Fossils are primarily found in sedimentary rocks because these rocks form from the accumulation of sediments, which can preserve organic remains. Therefore, the statement is true.

Front

What is the primary process involved in the formation of sedimentary rocks?

Back

Cementation

Answer explanation

Cementation is the primary process in sedimentary rock formation, where minerals precipitate from water and bind sediment particles together, solidifying them into rock. Erosion, melting, and metamorphism are not the main processes for sedimentary rocks.

Front

Which of the following is NOT a type of sedimentary rock? Clastic, Igneous, Chemical, Biochemical

Back

Igneous

Answer explanation

Igneous rocks are formed from the cooling and solidification of magma or lava, while clastic, chemical, and biochemical rocks are types of sedimentary rocks formed from sediments, minerals, or organic materials.

Front

What is the term used to describe the layers found in sedimentary rocks?

Back

Strata

Answer explanation

The term 'strata' refers to the distinct layers found in sedimentary rocks, formed by the accumulation of sediments over time. Other options like foliation and veins pertain to different geological features.

Front

Why are fossils commonly found in sedimentary rocks?

Back

Sedimentary rocks form in environments where organisms live and die.

Answer explanation

Fossils are commonly found in sedimentary rocks because these rocks form in environments where organisms live and die, allowing their remains to be preserved. Other rock types do not typically provide such conditions.

Front

Which process is NOT part of the sedimentary rock cycle? Options: Weathering, Erosion, Melting, Deposition

Back

Melting

Answer explanation

Melting is not part of the sedimentary rock cycle; it is associated with igneous rock formation. The sedimentary rock cycle includes weathering, erosion, and deposition.

Front

Common use of sedimentary rocks? Options: Fuel for nuclear reactors, Building materials, Jewelry, Insulation

Back

Building materials

Answer explanation

Sedimentary rocks are commonly used as building materials due to their durability and availability. They are often used in construction for bricks, concrete, and decorative stones, making this the correct choice.