________ is a natural process that causes rock to change, breaks them down, and causes them to crumble.
________ weathering breaks rocks into smaller pieces without changing them chemically.
When ________ weathering occurs the small pieces of rock that break off are identical in composition to the original rock.
Ice wedging is a type of ________ weathering.
________ ________ is the freezing and thawing process that breaks apart rocks.
Ice wedging breaks apart rocks because water ________ when it freezes into ice.
________ in roads are formed because of ice wedging.
Plant ________ can break apart rocks.
When plant roots break apart rocks this is a type of ________ weathering.
________ can break apart rocks when they tunnel and burrow through the soil.
When animals tunnel and burrow their way through rock this is a type of ________ weathering.
________ weathering occurs when the chemical composition of rock changes.
When water mixes with carbon dioxide from the air or in the soil ________ ________ is formed.
Carbonic acid is a ________ acid.
Carbonic acid ________ dissolves the rock it comes in contact with.
When carbonic acid forms in the atmosphere and falls to the ground as rain we called this ________ ________.
Plants can also ________ break down rocks by producing a plant acid called tannic acid.
________ is a very short green plant that can grow on rocks and break them down chemically.
________ is the effects of chemical changes caused by oxygen.
When iron-containing materials such as steel are oxidized a chemical reaction causes the material to ________.
Some rocks can be colored red or orange when iron-bearing minerals in them react with ________.
Even a tiny amount of iron in rock can combine with oxygen and form a reddish ________ ________.
Another name for rust is ________ ________.
Another name for iron oxide is ________.
________ is a mixture of weathered rock, organic matter, water, and air that supports the growth of plant life.
Organic matter includes decomposed ________, twigs, roots, and other types of organic material.
Organic matter includes decomposed leaves, ________ , roots, and other types of organic material.
Organic matter includes decomposed leaves , twigs, ________, and other types of organic material.
There are ________ factors that affect soil formation.
________ ________, slope of land, climate, time, and organisms are all factors of soil formation.
slope of land
Parent rock, ________ _____ ________, climate, time, and organisms are all factors of soil formation.
Parent rock, slope of land, ________, time and organisms are all factors of soil formation.
Parent rock, slope of land, climate, ________ and organisms are all factors of soil formation.
Parent rock, slope of land, climate, time and ________ are all factors of soil formation.
The slope of the land is also called ________.
________ is the surface features of an area.
On steep hillsides soil has ________ chance of developing.
In lowland areas where the land is flat soil has a ________ chance of developing.
If rock weathers quickly, ________ soils develop.
If rock weathers slowly, ________ soils develop.
________ regions where the weather is warm and moist have lots of organic matter in the soil.
________ regions where the weather is hot and dry have very little organic matter in the soil.
When plants and animals die, decomposition by fungi and bacteria form a soil called ________.
________ helps soil hold water and provides nutrients that plants need to grow.
As soils develop, they become ________ like the rock from which they formed.
________, organisms that consist of an alga and a fungus living together, can chemically breakdown rock.
Some of the best farmland is where ________ used to be.
________ is the wearing away and removal of rock or sediment.
Erosion occurs because ________, ice, wind, and water sculpt Earth's surface.
Erosion occurs because gravity, ________, wind, and water sculpt the Earth's surface.
Erosion occurs because gravity, ice, ________, and water sculpt the Earth's surface.
Erosion occurs because gravity, ice, wind, and ________ sculpt the Earth's surface.
________ is a force that pulls every object toward every other object.
Gravity pulls everything on Earth towards its ________.
Gravity causes water to flow ________ and rocks to tumble down slopes.
Gravity causes water to flow downhill and rocks to ________ down slopes.
________ ________ occurs when gravity alone causes rock or sediment to move down a slope.
There are ________ types of mass movements.
________, slump, rock slides, and mudflows are four types of mass movements.
Creep, ________, rock slides, and mudflows are four types of mass movements.
Creep, slump, ________ ________, and mudflows are four types of mass movements.
Creep, slump, rock slides, and ________ are four types of mass movements.
________ is the name for a process in which sediments move slowly downhill.
Creep is common where ________ and thawing occurs.
Creep is common where freezing and ________ occurs.
A ________ occurs when a mass of rock or sediment moves downhill along a curve surface.
During a ________ ________ layers of rock break loose from slopes and slide to the bottom of the slope.
Where heavy rains or melting snow and ice saturate sediments, ________ can develop.
A ________ is a mass of wet sediment that flows downhill over the ground surface.
Over many years, the snow can accumulate to form large, deep masses of ice called ________.
When the ice in a glacier becomes thick enough , its own ________ causes it to flow down hill under the influence of gravity.
As glaciers move over Earth's surface, they ________ materials from some areas and deposit sediment in other areas.
As glaciers move over Earth's surface, they erode materials from some areas and ________ sediment in other areas.
There are ________ kinds of glaciers.
________ glaciers in polar regions cove about ten percent of the Earth and are so large and thick that tye can bury mountain villages.
________ glaciers are much smaller and are located in high mountains where the average temperature isn't warm enough to melt the ice sheets.
Continental and valley glaciers move and cause ________.
In mountains, valley glaciers can remove rock from the mountaintops to form large bowls called ________ and steep peaks called horns.
In mountains, valley glaciers can remove rock from the mountaintops to form large bowls called cirques and steep peaks called ________.
The sediment deposited by glacier ice is called ________.
________ is a mixture of different-sized particles of rock, ranging from clay to large boulders.
Sand and gravel deposits laid down by glacier rivers is called ________.
Unlike till, outwash usually consists of particles of rock that are all about the same ________.
When ________ occurs wind leaves behind particles of rock too heavy to move.
________ is a form of erosion that can make pits in rocks and produce smooth, polished surfaces.
Water the flows over Earth's surface is called ________.
________ erosion occurs when a thin sheet of water carries away loose grains of sediment.
________ are small channels cut into the sediment at Earth's surface.
When rills widen and deepen they become ________.
________ are the most important agent of erosion on Earth.
________ shape more of Earth's surface than ice, wind, or gravity.
________ are areas where rivers enter oceans or lakes, the water slows and sediment is deposited.