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Energy
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New York State Earth Science June 2008 - Question 10 |
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Monday, 03 August 2009 10:03 |
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Correct Answer: Option 1 – in the sun by fusion
Sun is a star with gases such as hydrogen and when hydrogen atoms react they produce helium and energy. The above reaction occurs in the sun and since hydrogen atoms add up to form helium, the reaction is termed as a fusion reaction.
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Last Updated on Monday, 03 August 2009 10:37 |
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New York State Earth Science June 2008 - Question 19 |
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Monday, 03 August 2009 10:07 |
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Correct Answer: Option 4 – rough, black surface
Insolation is a measure of solar radiation energy received on a given surface area in a given time. Rough and black surface would reflect least amount of light and absorb the maximum amount of insolation among others.
Hence, options 1, 2 and 3 are incorrect.
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Last Updated on Monday, 03 August 2009 10:36 |
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New York State Earth Science June 2008 - Question 24 |
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Monday, 03 August 2009 10:09 |
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Correct Answer: Option 2 – Asthenosphere
The lithosphere (which includes the crust) is the outermost layer of the Earth and is cooler and more rigid than the layer below. The asthenosphere underneath is hot and flexible, transferring some of its heat through convection. In this case, the molten rock (magma) moves towards the cooler section, welling up through 100 km deep cracks in the lithosphere. When the two sides of the crack move apart, the cooled rock forms new tectonic plate material.
The plates ride on the asthenosphere, sometimes moving apart, sometimes past each other and other times moving together at plate boundaries. By using the global positioning system (GPS) over a period of years, the plates have been measured as moving from a few millimeters to up to 20 cm per year. Over many millions of years, this can mean thousands of kilometers of movement.
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Last Updated on Monday, 03 August 2009 10:35 |
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New York State Earth Science June 2008 - Question 75 |
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Monday, 03 August 2009 10:09 |
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Correct Answer:
According to the diagram the earth is positioned in such a way that the Sun's direct rays are at the equator on this day, hence, giving a 12 hours insolation time for the Arctic circle and the equator.
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Last Updated on Sunday, 09 August 2009 12:39 |
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