Question 1

The most important factor influencing soil type and thickness is ____________________.

Accepted Answer

The answer of The most important factor influencing soil type...

Question 2

Some types of bacteria are extremely important in changing atmospheric nitrogen into a form of ____.

Accepted Answer

A) oxygen that is released into the atmosphere 
B) carbon dioxide that speeds decomposition 
C) carbon dioxide that aids in plant growth 
D) soil nitrogen suitable for use by plants 
E) nitroglycerine for uptake by plant roots 
A) oxygen that is released into the atmosphere 
B) carbon dioxide that speeds decomposition 
C) carbon dioxide that aids in plant growth 
D) soil nitrogen suitable for use by plants 
E) nitroglycerine for uptake by plant roots

Question 3

Hydrolysis is particularly effective in weathering ____.

Accepted Answer

A) limestone 
B) sandstone 
C) bauxite 
D) calcite 
E) feldspar 
A) limestone 
B) sandstone 
C) bauxite 
D) calcite 
E) feldspar

Question 4

An important weathering product of the hydrolysis of orthoclase is ____.

Accepted Answer

A) ferromagnesium 
B) sand 
C) dissolved calcium 
D) clay minerals 
E) accessory minerals 
A) ferromagnesium 
B) sand 
C) dissolved calcium 
D) clay minerals 
E) accessory minerals

Question 5

The process that decomposes rocks and minerals by altering the makeup of the parent material is called ____________________.

Accepted Answer

The answer of The process that decomposes rocks and minerals...

Question 6

Rills are ____.

Accepted Answer

A) steep slopes where soils form slowly 
B) flat areas where soils form slowly 
C) rocky areas where soil formation is difficult 
D) shallow enough to be eliminated by plowing 
E) too deep to be eliminated by plowing 
A) steep slopes where soils form slowly 
B) flat areas where soils form slowly 
C) rocky areas where soil formation is difficult 
D) shallow enough to be eliminated by plowing 
E) too deep to be eliminated by plowing

Question 7

In a soil profile, horizon A is called the zone of accumulation.

Accepted Answer

A) True 
 B)False

Question 8

What is differential weathering?

Accepted Answer

Differential weathering is wea

Question 9

Horizon A in a soil is ____.

Accepted Answer

A) low in organic matter 
B) the site of little biological activity 
C) comprised entirely of sand and gravel 
D) where the parent material of the soil is located 
E) composed mostly of clays and stable minerals 
A) low in organic matter 
B) the site of little biological activity 
C) comprised entirely of sand and gravel 
D) where the parent material of the soil is located 
E) composed mostly of clays and stable minerals

Question 10

Why are soils considered one of our most precious natural resources?

Accepted Answer

If it were not for soils, food productio

Question 11

An overall average rate of soil formation might be about ____ per century.

Accepted Answer

A) 2.5 cm 
B) 25 cm 
C) 2.5 m 
D) 25 m 
E) 250 m 
A) 2.5 cm 
B) 25 cm 
C) 2.5 m 
D) 25 m 
E) 250 m

Question 12

In the tropics where chemical weathering is intense and leaching of most minerals is complete, a soil termed ____________________ forms.

Accepted Answer

The answer of In the tropics where chemical weathering is...

Question 13

Salinization of soils ____.

Accepted Answer

A) aids in plant growth 
B) makes them unfit for agriculture 
C) increases the rate of soil formation 
D) decreases the rate of weathering 
E) inhibits salt formation 
A) aids in plant growth 
B) makes them unfit for agriculture 
C) increases the rate of soil formation 
D) decreases the rate of weathering 
E) inhibits salt formation

Question 14

Organisms contribute to chemical weathering by ____.

Accepted Answer

A) mixing soil 
B) bringing material from depth to the surface 
C) wedging themselves into cracks in rocks 
D) mixing sediment particles 
E) removing ions from soil water 
A) mixing soil 
B) bringing material from depth to the surface 
C) wedging themselves into cracks in rocks 
D) mixing sediment particles 
E) removing ions from soil water

Question 15

Erosion is the ____.

Accepted Answer

A) movement of weathered material from its source site 
B) decomposition of soil 
C) disintegration of rock 
D) separating of soil into its constituent layers 
E) process of caliche formation 
A) movement of weathered material from its source site 
B) decomposition of soil 
C) disintegration of rock 
D) separating of soil into its constituent layers 
E) process of caliche formation

Question 16

The actions of ____________________ and ____________________ are responsible for most soil erosion.

Accepted Answer

wind, wate

Question 17

____________________ refers to reactions with oxygen to form an oxide or a hydroxide.

Accepted Answer

The answer of ____________________ refers to reactions with oxygen to...

Question 18

Humus ____.

Accepted Answer

A) is the material always comprising the topmost soil horizon 
B) is the dark, organic-rich material formed by bacterial decay 
C) is also known as organic litter 
D) always includes large amounts of sediments 
E) forms from the chemical weathering of the parent rock 
A) is the material always comprising the topmost soil horizon 
B) is the dark, organic-rich material formed by bacterial decay 
C) is also known as organic litter 
D) always includes large amounts of sediments 
E) forms from the chemical weathering of the parent rock

Exam 6: Weathering, Erosion, and Soil

The most important factor influencing soil type and thickness is ____________________.

Some types of bacteria are extremely important in changing atmospheric nitrogen into a form of ____.

Hydrolysis is particularly effective in weathering ____.

An important weathering product of the hydrolysis of orthoclase is ____.

The process that decomposes rocks and minerals by altering the makeup of the parent material is called ____________________.

Rills are ____.

In a soil profile, horizon A is called the zone of accumulation.

What is differential weathering?

Horizon A in a soil is ____.

Why are soils considered one of our most precious natural resources?

An overall average rate of soil formation might be about ____ per century.

In the tropics where chemical weathering is intense and leaching of most minerals is complete, a soil termed ____________________ forms.

Salinization of soils ____.

Organisms contribute to chemical weathering by ____.

Erosion is the ____.

The actions of ____________________ and ____________________ are responsible for most soil erosion.

____________________ refers to reactions with oxygen to form an oxide or a hydroxide.

Humus ____.

Understanding Earth: a Dynamic and Evolving Planet

Plate Tectonics: a Unifying Theory

Minerals: The Building Blocks of Rocks

Igneous Rocks and Plutons

Volcanoes and Volcanism

Sediment and Sedimentary Rocks

Metamorphism and Metamorphic Rocks

Earthquakes and Earthapos;s Interior

Deformation, Mountain Building, and Earthapos;s Crust

Mass Wasting

Running Water--Streams and Rivers

Groundwater

Glaciers and Glaciation

The Work of Wind and Deserts

Oceans, Shorelines, and Shoreline Processes

Geologic Time: Concepts and Principles

Organic Evolution--The Theory and Its Supporting Evidence

Precambrian Earth and Life History

Paleozoic Earth History

Paleozoic Life History

Mesozoic Earth and Life History

Cenozoic Earth and Life History

Filters

The actions of and are responsible for most soil erosion.