6th Gr. Science Ch. 7 Weathering & Erosion

Chemical weathering is more rapid in a ___climate.

Leaving plant stalks undisturbed in the field to cover the soil is known as ___.

When unpainted iron lawn furniture sits outside in the rain & begins to rust, ___ has occurred.

Compared to the A horizon in a soil profile, the B horizon ___.

You can see the different layers of soil that make up a __ on a hillside where rocks have been exposed.

The organic material in humus includes___.

Forest harvesting creates the most severe problems in ___regions.

Planting along the natural contours of the land on gentle slopes is called ___.

The difference between mechanical & chemical weathering is ___.

Soil horizons in the deserts are ___ that soil horizons in wetter climates.

Causes of soil erosion include____.

Wind erosion o f the land can be reduced by planting ___ of trees.

When livestock eat all the grass on the land, the land is said to be ___.

Oxidation requires a combination of 3 things: ___.

In no-till farming, plant stalks are ___.

Weathering occurs most rapidly in the ___ horizon.

Agricultural practices that slow soil erosion include____.

The A horizon is high in ___.

Soil is a mixture of weathered rock and ___.

Over 1000s of years, ___has chemically weathered limestone, creating caves.

___ has occurred when chemical reactions dissolve the minerals in rocks or change them into different minerals.

The layer of soil that contains the most humus & smaller rock & mineral particles than the other layers in the _ horizon

Water freezing & cracking rock & tree roots spreading through rock are examples of ___.

Ice wedging is caused by ____.

How fast weathering occurs depends on the ___of an area.

Mountain peaks, where water freezes & thaws often, are often weathered by ___.

___ is the process by which water moves minerals down from one soil layer to another.

The B horizon is ____.

All of the following are direct causes of mechanical weathering except___.

Mechanical weathering is more rapid in a ___ climate.

The minerals found in B & C horizons were dissolved in water & carried down to those soil layers by a process called

Leaching occurs mainly in the ___ horizon.

___ is organic matter made of decayed plants & animals.

When weathered rock, decayed organic matter, mineral fragments, water, & air are combined, ___ is formed.

An area's climate is its ___.