Concept #7 Quiz

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Concept #7 Quiz
Choose the best possible answer to the following questions about Key Concept 7 "Underground erosion: Caverns and karst terrains ."

This activity contains 7 questions.

Caves form by the dissolution of rock by groundwater. If so, which of the following best explains how parts of caverns may be devoid of water (i.e., aerated)?

streams formerly flowing on the surfaces were diverted into the groundwater system through sinkholesthe caves formed and later the water table rose, causing the water to move above the cavethe main water table is perched above the cavern roofs, allowing air to enter a nearby, downcutting stream lowered the water table after the caves had formed

Match the form associated with karst terrains with the appropriate description:

Using the pull-down menus, match each item in the left column to the corresponding item in the right column.


	flowing water disappears downstream and continues flowing underground

	a sub-circular surface expression of collapsed caverns

	a linear surface expression of subsurface dissolved rocks

	form in wet tropical climates where the rocks are dominantly limestone

2.1 rock towers

2.2 solution valley

2.3 sinkhole

2.4 sinking stream

Identify the indicated karst features at each label on the diagram:

The letters A through F appear on an image associated with this question.

For each item below, use the pull-down menu to select the letter that labels the correct part of the image.
3.1 collapsed cavern

3.2 aerated cave

3.3 sinking stream

3.4 sinkholes

3.5 water-filled cave

3.6 water table

Which of the following is part of what is called “karst” topography?

several wells are artesianperched water table springs on hillsides and gaining streamsstreams flowing into depressions and continuing undergroundperennial, losing streams fed by large springs

Match the cave-formation term with the appropriate description:

Using the pull-down menus, match each item in the left column to the corresponding item in the right column.


	when the water table drops, caves may have no way to support the roof

	calcite precipitated as flat shield-like forms on the floors of aerated caves

	calcite precipitated on the interiors of caves

	calcite precipitated as icicle-like forms on the roofs of aerated caves

5.1 sinkhole

5.2 dripstone

5.3 stalagmite

5.4 stalactite

Which of the following is indicated by dripstones on the roofs of caverns?

the cave roof was below the water table sometime after the dripstones formed the cave roof was above the water table when the dripstones formedthe cave roof was below the water table when the dripstones formedthe cave floor was above the water table and the roof was below the water table when the dripstones formed

Which of the following concerning stalactites and stalagmites is NOT TRUE?

Both stalactites and stalagmites are forms of “dripstones.”Stalagmites form on the floors of caves below the water table.Stalactites hang from the ceiling whereas stalagmites grow upward from the floor.Both stalactites and stalagmites are composed of calcium carbonate.Stalactites are deposited from water dripping from the ceiling of an aerated cavern.

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