Chapter 21 test review

The ____ horizon has smaller rock and mineral particles than the other layers. a. A c. C b. B d. D

a

The layer of soil that contains the most organic material is called the ____ horizon. a. A c. C b. B d. D

a

t/f : Groundwater is found in pores of soil and rock.

t

t/f: A low volume of pores means the rock has low porosity.

t

t/f: The greater the slope of the water table, the faster the groundwater flows.

t

The mass of clay, silt, sand, and boulders that covers much of the United States was deposited by ____. a. farming c. ice wedging b. glaciers d. huge bulldozers

b

The rate of weathering depends upon the area's ____. a. oxygen c. water b. climate d. soil

b

A well that is drilled into a pressurized aquifer is called a ___ a. sandwiched aquifer c. artesian well b. spring d. geyser

c

Because desert soils contain little organic material, their soil profiles have ____ horizons. a. thick c. thin b. no d. b or c

c

Chemical weathering ____. a. is caused by freezing and thawing b. breaks apart rocks by physical processes c. occurs when chemical reactions dissolve or change the minerals in rocks d. none of above

c

Geologic time is divided into units based upon types of a. sedimentary rocks c. organisms b. climatic changes d. igneous rocks

c

Homo sapiens probably appeared ____ ago. a. 66 million years c. 400,000 years b. 6 million years d. none of the above

c

Mechanical weathering is more rapid in a ____ climate. a. dry c. cold b. hot d. humid

c

The B horizon is ____. a. rockier than the C horizon c. lighter than the A horizon b. richer in humus than the A horizon d. thinner than the C horizon

c

The ____ in rocks are the spaces between the grains and crystals, and also are the cracks in rocks. a. deposits c. pores b. saturation zones d. sediments

c

The ____ is the zone where pores are full of water. a. zone of aeration c. zone of saturation b. zone of fractures d. water table

c

The difference between mechanical and chemical weathering is ____. a. the length of time each takes to break up a rock b. that only chemical weathering involves water c. the way they affect the makeup of a rock d. all of the above

c

The entire land area drained by a stream is called the drainage ____. a. point c. basin b. bar d. fan

c

The rock and mineral fragments in soil come from rock that has been ____. a. blasted b. carved c. weathered d. chemically treated

c

A ____ separates a drainage basin of one stream from the drainage basin of another. a. point c. erosion b. bar d. divide

d

All of the following cause mechanical weathering EXCEPT a. ice c. burrowing animals b. tree roots d. carbonic acid

d

Cenozoic Era life-forms include ____. a. humans c. marine mammals b. reptiles d. all of the above

d

Soil erosion occurs ____. a. where animals eat away all the plants b. when forests are removed c. on steep slopes d. all of the above

d

The longest subdivision in geologic time is a(n) ____. a. epoch c. century b. period d. eon

d

The organic matter in humus is made of ____. a. dead worms c. roots b. stems d. all of the above

d

____ existed during the Mesozoic Era. a. Angiosperms c. Birds b. Humans d. both a and c

d

____ is a factor that affects soil development. a. Time c. Type of rock b. Slope d. all of the above

d

____ rock contains well-connected pores and allows groundwater to flow through it. a. Nonporous c. Impermeable b. Low-porosity d. Permeable

d

t/F: Streams with high suspended load appear clear.

f

t/f: As the human population continues to increase, less groundwater will be used.

f

true or false: Absolute age examines the position of rocks in a sequence.

f

true or false: Radiocarbon dating would be useful in dating the age of Earth.

f

The end of the Paleozoic Era was signaled by ____. a. the development of humans b. mass extinction of land and sea animals c. the development of organisms with hard parts d. both a and b

b

Litter often covers the ____ horizon. a. A c. C b. B d. all of the above

a

Mechanical weathering ____. a. breaks apart rocks by physical processes b. occurs when chemical reactions dissolve or change the minerals in rocks c. occurs when iron is exposed to oxygen and water d. none of the above

a

Oxidation occurs when materials containing ____ are exposed to oxygen and water. a. iron c. kaolinite b. carbonic acid d. all of the above

a

____ streams have channels with many curves. a. Meandering c. Drainage b. Braided d. Canyon

a

A ____ is formed by sediment deposited where a stream empties into a gulf or a bay. a. fan c. braid b. delta d. floodplain

b

A stream can erode no deeper than its ____ level. a. angular c. core b. base d. point

b

Animal life in the Paleozoic Era included all of the following EXCEPT ____. a. marine life c. amphibians b. humans d. reptiles

b

Below the C horizon is ____. a. topsoil c. clay b. rock d. humus

b

Chemical weathering is more rapid in a ____ climate. a. warm, dry c. cold, dry b. warm, wet d. cold, wet

b

In areas where freezing and thawing occur frequently, rocks weather rapidly because of the ____ of freezing water. a. evaporation c. leaching b. expansion d. oxidation

b

Minerals found in the B horizon were dissolved in water and carried there by a process called ____. a. oxidation c. weathering b. leaching d. littering

b

Plants cannot grow without ____. a. rocks c. moss b. soil d. pesticides

b

Plants don't grow as well when ____ has been lost. a. clay c. parent rock b. topsoil d. slope

b

Soil is a mixture of weathered rock, mineral fragments, water, air and ____. a. sand c. moss b. decayed organic matter d. clay

b

Soils in ____ contain little organic material and are thin a. tropical areas c. prairies b. deserts d. temperate forests

b

Streams with bars, islands, and divided channels are called ____ streams. a. meandering c. drainage b. braided d. canyon

b

The division of Earth's history into smaller units makes up the ____. a. eras c. periods b. geologic time scale d. sequence of events

b