... than the fire. Dust blocked sunlight from the earth's surface for many months. Burned sulfur from the impact site, water vapor and chlorine from the oceans, and nitrogen from the air combined to produce worldwide fallout of intensely acidic rain. Scientists postulate that darkness and acid rain caused plant growth to die. As a result, both the herbivorous dinosaurs, which were dependent ... ago and caused the mass extinction, a hypothesis that has received considerable empirical support. The discovery of the centimeter-thick layer of clay at the boundary was also opportune. Alvarez foun...

• Word Count: 1029
• Approx Pages: 4
• Grade Level: Undergraduate

Ozone Layer Depletion Imagine a world with bad air, polluted water, starvation, increased cancer conditions and even limited land. It is all possible thanks to the effects of ozone depletion and global ... has already begun, we are already thinking of ways to reduce the effects it is causing; hoping that the processes will end. The Earth's atmosphere is divided into several layers. The lowest region, the troposphere, the next layer, the stratosphere, and the most atmospheric ozone are concentrated in a layer in the stratosphere, about ... strong odor oppose to normal oxygen which has two oxy...

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

1. A volcano is a mountain that forms when layers of lava and volcanic ash erupt and build up. 2. 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. When rock from the mantle melts, moves to the surface through the crust, ... is the magma underneath volcanoes. 11. 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. Two disadvantages of using geothermal energy to generate electricity in Hawaii would be tha...

• Word Count: 587
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• Grade Level: High School

... magnitude of capillary forces is thus variable, and can be much smaller or much larger than the gravitational force. 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. Most Earth materials are hydrophilic, which means that water adheres to them rather than being repelled. As a result ... , water in the unsaturated zone is preferentially drawn into small spaces over large ones, which tend to be occupied by air. In un-fractured rock, water occupies a three-dimensional network of interconnected...

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

... others insist on calling it a proven set of facts. 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. Furthermore, both opinions agree that this trend will have a great impact on Earth (Global Warming.com, 2012). 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...

• Word Count: 1061
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• Grade Level: Undergraduate

... it all backwards. We are so paranoid about some carbon monoxide exhausted by a factory in New Jersey that we forgot that one large volcanic eruption could cover the earth with a thin layer of dust. Or what about the 300 people that just died in Morocco buried under the rubble of their houses? Or the devastating earthquake in Iran a few weeks ago ... some Styrofoam, maybe. The Earth is going to brush us off like a bad case of fleas. The water will recover; the air will recover and if it's true that plastic does not decompose than the Earth will just incorporate plastic into a new pyridin...

• Word Count: 894
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• Grade Level: High School

... at this point, I would like to remind them that the "tailor-made" packages and software we use nowadays, do not materialise out of thin air. Someone, somewhere has made the effort to design them. Newer, better technology is coming into the market. There is stiff competition between the I.T. companies - and my opponents say "our creativity is being hindered" We cannot blame the Internet ... can compare it with life itself All around us, are temptations to lure us. We see people smoking, drinking and indulging in a variety of other vices. Yet, do we give into such temptations? We exercise...

• Word Count: 562
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• Grade Level: High School

... Rocky Mountains, are already constrained by climate, and are likely to face extreme stress and disappear entirely in some places. Global warming suggests the potential for forests to break up into an assortment of forests, savannas, and grasslands. Major adjustments to natural ecosystems due to climate change could have negative consequences for our economy, which depends in part on the ... return to the atmosphere. Trees also have a crucial role in the oxygen cycle: they make up an essential part of one of the world's life support systems. Agricultural expansion into forestland is the ...

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