... Online). "Astronomers even produced maps showing networks of canals they thought had been built by water deprived Martians"(Davies online)Photographs also show river valleys and flood channels. "A NASA orbiter found evidence of a vast frozen sea lying just below the powdery surface of Mars"(Janega online). This offers a promise to water for cooking, agriculture, and rocket fuel. This water ... to support plant and animal life(Bonsor online). Many have suggested different theories, which would be able to warm the planet and actually be successful. One theory suggests building two large mi...

• Word Count: 1265
• Approx Pages: 5
• Grade Level: High School

... we inhabit. Venus has a thick layer of constant cloud cover that reflects 85% of all the sunlight reaching the planet. This not only makes Venus the brightest object in the night sky (after the sun and moon), but also makes observational study very difficult, as we are unable to observe the surface from space. This has required many space missions with orbiters and probes to gather information ... studying Venus. Another interesting characteristic of Venus that has long puzzled scientists is the planet's unusual rotation. Like Uranus and Pluto, Venus rotates on its axis in the direction...

• Word Count: 2107
• Approx Pages: 8
• Grade Level: Undergraduate

... burning coal and oil in great amounts. This rises the levels of Carbon Monoxide in the air which has the ability to trap heat. So, eventually as CO2 rises so does the temperature of the Earth. In fact, global warming is expected to rise temperatures quicker in the polar regions than in the rest of the world. For example, the north polar cap in the last decade has thinned 2%. This is a significant ... without a home and therefore be doomed to extinction. As a result, species of animals and plants are vanishing one thousand times faster than at any point during the last 65 million years. ...

• Word Count: 1670
• Approx Pages: 7
• Grade Level: High School

... icehouse ages. Additionally, we know that the motion of the Earth, known as the Milankovitch cycles, also affect the Earth's atmosphere. These cycles - the Earth's elliptical orbit, the tilt of the Earth's axis, and the procession of the equinoxes - all have an effect on the Earth in various ways. The Earth's orbit brings the planet closer to the Sun at one point in its 100,000 year trip. The Earth's tilt also changes just a few degrees over ... about 0.4-0.8°C during the 20th century. The Committee also states that the changes observed over the last several decades are "likely mostly ...

• Word Count: 1437
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate

... driven by natural and human-influenced landscape and gas emission changes that can occur at the same time. Natural variations in temperature could be caused by variations in the earth's orbit, or variations in the sun's output, or several other factors including sulfur dioxide emitted by volcanoes. The precise contributions of these natural causes of temperature variations are unknown and unpredictable at ... forests alone is throwing hundreds of millions of tons of carbon dioxide into the atmosphere each year. We are also losing temperate forests. The temperate forests of the world accou...

• Word Count: 1457
• Approx Pages: 6