The A horizon is the youngest, uppermost layer of the soil horizon. It is often dark in color and contains large amounts of humus.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
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The B horizon is the middle of the three layers of soil and contains less humus than the A horizon.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
The C horizon is the bottom layer in the soil profile. It consists of partially weathered rock and has a composition similar to the bedrock, which underlies it.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
In a cold front, a cooler, denser air mass moves into and under a warmer, less dense air mass.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
When two air masses meet, a boundary, called a front, is formed.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
Hurricanes are large, swirling storms centered around very low pressure. They form over warm, tropical waters near the equator, typically from June to November.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
Approximately 75% of the world's reported tornadoes occur in the United States, with the majority occurring in an area called tornado alley.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
Hurricanes get their energy from moisture evaporating off warm, ocean waters. As this air rises, clouds form and more and more air is drawn into the system. As the storm system builds, winds begin to spin in toward the areas of low pressure.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
A warm front is formed when a less dense warm air mass meets and moves over a denser, cooler air mass.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
A wave is a disturbance that moves energy through a solid, liquid, or gas.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
Frequency is the number of complete waves that pass a point in a certain period of time.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010
The intensity of a sound wave is the amount of energy a wave carries through an area per second.
- Subject:
- Science
- Provider:
- Utah Education Network
- Author:
- Visual Learning Company
- Date Added:
- 02/28/2010