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Weathering (Ch2).

Name __________________________ HR_____
Date ______________
Across
Conservation ______is a method in which the dead stalks from a previous year's crops are left in the ground to hold the soil in place.
The layer of soil also called horizon B is the ______.
______ is the thick mass of grass roots and soil.
The most important factors that determine the rate at which weathering occurs are the type of rock and the _________.
Soil that is made up of about equal parts of clay, sand, and silt is called ______.
The removal of rock particles by wind, water, ice or gravity.
The decayed organic material in soil is called _____.
______ weathering can produce new minerals as it breaks down rock.
Materials that are full of tiny connected air spaces that water can seep through are called _______.
When ______ dioxide from air dissolves in rain water, it produces a weak acid called carbonic acid.
______ are soil organisms that break down the remains or organisms and digest them.
_______ is the most important cause of chemical weathering.
The type of weathering in which rock is physically broken into smaller pieces is called _______ weathering.
The smallest soil particles are ______.
Crop _______ is the planting of different crops in a field each year to maintain the soil's fertility.
The _______ of soil is a measure of how well the soil supports plant growth.
A process that splits rock when water seeps into cracks, then freezes and expands is called ice ________.
Down
_______ have small lumps on their roots that contain nitrogen fixing bacteria.
Chemical weathering occurs more quickly where the climate is both hot and ______.
The ______ ______ is the area of the Great Plains where wind erosion caused soil loss during the 1930's.
_____ is a mixture of humus, clay and other minerals that form the crumbly, topmost layer of soil.
The loose, weathered material on Earth's surface in which plants can grow is called _______.
The loose layer of dead plant leaves and stems on the surface of the soil is called ______.
________ is a chemical change in which a substance combines with oxygen.
The _____ of even small plants can pry apart cracked rocks.
The grinding away of rock by other rock particles
______ do most of the work of mixing humus with other materials in the soil.
_______ rain causes very rapid chemical weathering.
The process that breaks down rock and other substances on Earth's surface
The solid layer of rock beneath the soil is the ________.
Plowing fields along the curves of a slope to prevent soil loss is called _____ plowing.
Earthworms and burrowing animals help to _____, or mix air into, the soil.
When ______ combines with oxygen, the product is rust.