Between the molten iron core and the thin crust at the surface deep inside the earth there is a solid body of rock called the mantle. ... Two advantages of using geothermal energy to generate electricity in Hawaii would be to reduce the danger of oil spills from tankers and reduce air pollution. ... A cinder cone volcano forms when explosive eruptions and throws lava high into the air and the lava cools and hardens into tephra. ...

• Word Count: 587
• Approx Pages: 2
• Grade Level: High School

Instead some pores are filled with water, and others with air. ... An example of capillary forces exceeding gravity is capillary rise in a thin glass tube, where water is lifted upwards against the force of gravity. ... As a result, water in the unsaturated zone is preferentially drawn into small spaces over large ones, which tend to be occupied by air. ... Toxic waste that has leaked from containment facilities has seeped into the ground. ... The primary source of surface water is spring discharge from highly fractured plutonic rocks into streams along mountain foothills (INEGI, 1986). ...

• Word Count: 696
• Approx Pages: 3
• Has Bibliography
• Grade Level: Undergraduate

Ozone Layer Depletion Imagine a world with bad air, polluted water, starvation, increased cancer conditions and even limited land. ... The Earth's atmosphere is divided into several layers. ... Out of each 10 million air molecules, about 2 million are normal oxygen, but only 3 are ozone. ... When the ozone layer begins to thin, it lets more UV rays enter our atmosphere. ... The ozone layer is thinning; and the thinner it gets the more that future will continue to haunt us. ...

• Word Count: 942
• Approx Pages: 4
• Grade Level: High School

The forests play a large part in turning carbon monoxide into oxygen. ... The thinning is thought to be amazing since it occurs across the bottom of all the ice. ... The thinning ice in the Arctic is the home of most animals that live in the Arctic. ... With the ice thinning, it will be less able to support the weight of the walrus. ... As the permafrost melts, the gas escapes and increases the level of carbon in our air. ...

• Word Count: 1153
• Approx Pages: 5
• Has Bibliography
• Grade Level: High School

Agricultural expansion into forestland is the primary cause of tropical deforestation. ... Chemicals from waste dumps in some metropolitan areas are draining into backyards. Pesticides are leaking through the soil into drinking water wells in our agricultural belts. ... Refrigerators were designed to cool, but their coolants seep into the atmosphere and thin the Earth's protective shield. Americans want clean air, yet few are enthusiastic about the inconvenience of automobile exhaust inspections. ...

• Word Count: 700
• Approx Pages: 3
• Grade Level: Undergraduate

Although opinions are various, they both consider global warming is climate change that is leading to an increase in the overall air and water temperature. ... Earth absorbs energy from the sun; at the same time, Earth re-radiates the energy back into space. Normally, the thin layer of atmosphere can trap a portion of the outgoing radiation, which keeps Earth's temperature within a comfortable region; nevertheless, the layer of atmosphere is being thickened by a great deal of carbon dioxide and other greenhouse gases caused by humans. ...

• Word Count: 1061
• Approx Pages: 4
• Grade Level: Undergraduate

For example, ash that is spewed from an active volcano can reach up into the atmosphere and reflect solar radiation, essentially dimming the sun. ... The greenhouse effect may be a natural cause, but the air pollution of humans has increased its ability to retain heat. ... Its ability to rip the ozone apart with its free chlorine atoms leads to the thinning of the ozone and therefore more ultra violet radiation hitting earth's surface (IPCC, 2007). ...

• Word Count: 910
• Approx Pages: 4
• Has Bibliography