Sedimentary Rocks

What are the processes associated with lithification?

• compaction

• transport

• weathering

Where do sediments come from?

• Sediments come directly from the crystallization of magma from the Earth’s interior.

• Sediments are products of weathering and transported by glaciers, wind, and streams.

• Sediments are results of high temperature and pressure within the Earth’s interior.

• Sediments are results from varying mineral composition.

What common component or property of sedimentary rocks cannot be found in other rock types?

• alignment of minerals

• occurrence of fossil remains intergrowth of crystals

• occurrence of fossil remains

Which of the following is a biochemical sedimentary rock?

• travertine

• chert

• chalk

• gypsum

Which of the following properties distinguishes breccia from conglomerate?

• Breccia has angular gravel-size fragments while conglomerate is composed of rounded fragments.

• Breccia is composed of greater than 2 mm fragments while conglomerate is less than 2 mm.

• Breccia is mainly composed of mud-size fragments while conglomerate has silt-size components.

• Beccia is a dark-colored sedimentary rock while conglomerates are mostly light-colored.

Which of the names below are possible rock names if a hand sample contains shells and cemented shell fragments that can be seen by the naked eye?

• coquina

• chalk

• crystalline limestone

Which of the following rocks will feel smoothest in your hand?

• shale

• siltstone

• sandstone

• conglomerate

How would you describe the depositional environment of a detrital rock if it is composed of well-sorted, coarse and rounded clasts?

• The sediments were carried by a high-energy current at a small distance from the source rock.

• The sediments were carried by a high-energy current at a large distance from the source rock.

• The sediments were carried by a low-energy current at a large distance from the source rock.

• The sediments were carried by a low-energy current at a small distance from the source rock.

An unknown sedimentary rock is said to be comprised mainly of very fine crystals of quartz and occurs as a light-colored rock. Given the said information, what would be the proper name for the rock?

• chert

• sandstone

• limestone

• bituminous coal