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Weathering & Soil (Ch 6)

Class: ___________ Date: ________
In crop _______, a farmer plants different crops in a field each year.
Some rocks weather more easily because they are ______. That means they are full of tiny, connected air spaces that allow water to seep in.
The _______ of soil is a measure of how well the soil supports plant growth.
In ______ plowing, farmers plow their fields along the curves of a slope instead of in straight rows.
The _______ scale measures acidity.
As ______ grow, they force the cracks in rocks apart.
Chemical weathering occurs more quickly where the climate is both ______ and wet.
A substance with a pH of 7 is ______.
In _____ plowing,dead weeds and stalks of the previous year's crop are plowed into the ground.
_______ is the solid layer or rock beneath the soil.
______ rain is one agent of chemical weathering.
Iron combines with oxygen in the presence of water in a process called ______.
As rocks break into pieces, more _____ area is exposed to chemical weathering.
The type of weathering that physically breaks rock into smaller pieces is _______ weathering.
Sand and other rock particles that are carried by wind, water or ice wear away rock surfaces like sandpaper on wood. This process is called ______.
The loose, weathered material on Earth's surface in which plants can grow.
A layer of soil is called a ________.
Carrying away rock particles by wind, water, ice and gravity is ______.
The substance with a pH above 7 is _____.
Soil that is made up of about equal parts of clay, sand, and silt is called _______.
Soil decomposers include ________ (such as mushrooms) bacteria, worms and other organisms.
When carbon dioxide dissolves in water it forms _______ acid.
Carbonic acid easily weathers some kinds of rocks, such as marble and _______.
The process that breaks rock down.
_______ weathers some rock by dissolving it.
Soil horizon B is called _______.
Humus contains ______ that plants need.
Soil horizon A is made up of ______.
______ is the dark-colored substance that forms as plants and animal remains decay.
Mechanical weathering can occur by animal action such as when moles ______ in the ground.
Soil is one of Earth's most valuable natural _______.
________ are the organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals.
The most important factors that determine the rate at which weathering occurs are the type of rock and the ________.
Water seeps into cracks in rock and freezes there, expanding as it freezes. This widens cracks and forces the rock apart in a process called frost _______.
As plant's roots grow, they produce weak _______ that slowly dissolve rock around the roots.
In the 1930's farms were destroyed when soil blew away in an area that became known as the Dust ______.