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Chapter 10 - Holt McDougal
Weathering and Soil Formation
24
Science
6th Grade
10/05/2012

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Term
What is weathering?
Definition
The process by which rock materials are broken down by the action of physical or chemical processes.
Term
Describe chemical weathering.
Definition
the process by which rocks break down as a result of chemical reactions
Term
Describe physical weathering.
Definition
Term
What is abrasion?
Definition
the grinding and wearing away of rock surfaces through the mechanical action of other rock or sand particles.
Term
How does water create abrasion?
Definition
When rocks and pebbles roll along the bottom of swiftly flowing rivers, they bump into and scrape against each other.
Term
How does wind create abrasion?
Definition
sand and silt hitting against exposed rock, the sand eventually wears away the rock’s surface.
Term
How does gravity create abrasion?
Definition
when rocks fall on one another.
Term
What forces cause abrasion?
Definition
water, wind, gravity
Term
How do plants break rock?
Definition
They send their roots into existing cracks in rocks. As the plant grows, the force of the expanding root becomes so strong that the crack widens. Eventually, the entire rock can split apart.
Term
How do animals take part in weathering?
Definition
They burrow through the soil and move soil particles around. This exposes fresh surfaces to continued weathering. The mixing and digging that animals do contributes to chemical weathering.
Term
How is water chemical weathering?
Definition
Even hard rock, such as granite, can be broken down by water. But, it just may take thousands of years.
Term
What is acid precipitation?
Definition
Rain, sleet, or snow, that contains a high concentration of acids.
Term
What are fossil fuels?
Definition
nonrenewable energy resource formed from the remains of organisms that lived long ago; examples include oil, coal, and natural gas
Term
How do acids in groundwater take
part in weathering?
Definition
they react with rocks in the ground, such as limestone. A chemical reaction occurs and over time the limestone is eaten away or dissolved.
Term
How do acids in living things influence weathering?
Definition
Lichens produce acids that can slowly break down rock.
Term
How is the air a part of weathering?
Definition
The oxygen in the air is reacting with the iron in the car, causing the car to rust.
Term
Describe differential weathering.
Definition
a process by which softer, less weather resistant rocks wear away and leave harder, more weather resistant rocks behind.
Term
Describe how the shape of rock affects
weathering.
Definition
The more surface area that is exposed to weathering, the faster the rock will be worn down.
Term
compare climate to weather.
Definition
The average weather condition in an area over a long period of time.
Term
How does temperature affect weathering?
Definition
Rate of chemical weathering is faster in warm, humid climates.
Term
How does water
affect weathering?
Definition
Water also increases the rate of mechanical weathering.
Term
How does elevation
affect weathering?
Definition
rocks at higher elevations, as on a mountain, are exposed to more wind, rain, and ice than the rocks at lower elevations are. This increase in wind, rain, and ice at higher elevations causes the peaks of mountains to weather faster.
Term
How does gravity affect weathering
Definition
The steepness of mountain slopes increases the effects of mechanical and chemical weathering. Steep slopes cause rainwater to quickly run off the sides of mountains. The rainwater carries the sediment down the mountain’s slope. This continual removal of sediment exposes fresh rock surfaces to the effects of weathering. New rock surfaces are also exposed to weathering.
Term
What is climate?
Definition
The average weather condition in an area over a long period of time.
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