asrt ch 9 10 11

asrt ch 9 10 11 - The Living Earth 1. Water a. We have...

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The Living Earth 1. Water a. We have water in 3 forms- solid, liquid and gas i. Solid- ice ii. Liquid- water as seas and oceans iii. Gas- atmospheric water vapor 2. Surface a. The surface of Earth is very active i. We have been hit a lot in the time of Earth’s existence, but it does not show because of the fact that Earth is geologically active and reshapes itself. 3. Energy Sources a. Motion of water in oceans, lakes and rivers i. This uses solar energy and tidal forces b. Motion of the atmosphere i. This uses solar energy c. Reshaping of the surface i. Earth’s internal heat causes this d. Life i. Solar energy is used (a few species that live on the ocean floor make use of the Earth’s internal heat) ii. WE NEED THE SUN! 4. Convection a. Convection is basically the question of why things happen i. Thing of a pot on a stove. The water closest to the heat source rises and it goes in a circle 1. Convection moves hot water from the bottom to the top where it cools, moves laterally, sinks, warms up and rises again ii. The average temperature on earth is 57 degrees 1. The earth does not reflect all the light it collects, but absorbs only 61% b. Greenhouse Affect i. Requirements 1. You need a greenhouse gas- water vapor, carbon dioxide and methane 2. Upper layers of the atmosphere allow certain wavelengths of light to come in and out. Eventually, there must be a leak. 3. Ozone is not the same!!! ii. Steps 1. Sunlight arrives at the earth 2. 39% of sunlight is reflected by clouds and the surface 3. Sunlight that is not reflected is absorbed by surface, heating it. 4. Heated surface emits infrared radiation 5. Some infrared radiation is trapped by atmosphere, heating both atmosphere and surface 6. Remaining infrared radiation “leaks” into space c.
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Our Barren Moon 1. We did go to the moon! a. People say that we did not go to the moon because there were no background stars. Unfortunately, you have to expose your digital film for several minutes if you want to have stars. i. Stars cannot be in the pictures because stellar photography is very different 2. Moon a. The moon is roughly 1/3 the size of Earth i. The moon orbits the earth and the earth orbits the sun 1. When you have one thing orbiting another, the smaller orbits around the larger. The details complicate things. The center of mass of the Earth-Moon system moves in an elliptical orbit around the sun. 2. Using Kepler’s laws, you can b. Time to think i. You are living at a moon base and watch the motions of the Earth and Sun in the lunar sky. What would you see? 1. The Earth would rise and set once a lunar month, and the Sun would rise and set once a lunar month. 2. The Earth would rise and set once a lunar month, and the Sun would not appear to move significantly in the lunar sky. 3.
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This note was uploaded on 04/28/2008 for the course ASTR 1101 taught by Professor Campbell during the Spring '08 term at LSU.

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asrt ch 9 10 11 - The Living Earth 1. Water a. We have...

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