Test 1 Study Guide

Test 1 Study Guide - Edwards 1 Oceanography Test 1 Study...

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Edwards 1 Oceanography Test 1 Study Guide Chapter 2 Big Bang and Planet Condensation -The big bang occurred about 14 million years ago. All of the mass and energy, which was originally confined at one place, began to expand away from one another and the expansion continues today. The condensation theory states that planets were formed by contracting, accreting clouds of dust, gas, and debris. Why life started in oceans -The characteristics of water (ability to retain heat and moderate temperature) make it a good starting point for the creation of life. Also, we know that all life on Earth depends on the ability of a substance to use water within itself. This suggests a common origin. Miller-Urey experiments -These experiments simulated the formation of early life on Earth. Important amino acid and other compounds were created, and although these are not life, they are the building blocks of it. Types of rock -There are three types of rock: 1) igneous (crust) = the solidification of cooled magma. usually volcanoes. This rock is formed beneath the Earth’s crust. 2) metamorphic = the result of the transformation of a pre-existing rock type called a protolith by means of heat and extreme pressure. 3) sedimentary = typically created by erosion. Can be classified by particle size or type (terrigenous, hydrogenous, etc….see Chp.5) Origins of the ocean and atmosphere -The first atmosphere was probably made of gases like methane and ammonia but was destroyed by the asteroid that created our moon. The new atmosphere was created by outgassing release of gases which had been trapped inside the forming planet. As the hot vapors rose they condensed into clouds. After millions of years the vapors cooled and began to form hot water droplets. As these droplets fell to the hot Earth and they rose back again as gas and the process continued until the Earth was cool enough to hold the now-salty seawater. Ages of universe, Earth, and first life forms -The universe is 14 billion years old, the Earth is 4.6 billion years old, and the first life forms are about 3.6 billion years old. Who were the first organisms? -bacteria. Single-celled with no nucleus. They were ATP-producing energy factories like mitochondria. Blue-green bacteria have the ability for photosynthesis. It was the beginning of plant cells.
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Edwards 2 Chapter 3 Structure of the Earth - The earth is layered with each layer becoming denser. There are three main layers: 1. The crust is the thin outermost layer made up of lithosphere (a covering of the Earth made up of movable plates). There are two crusts: the oceanic crust is made up mostly of basalt (10 km thick) and the continental crust is made up mostly of granite (35-40 km thick). The large crystals in granite allow it to float. 2. The
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This note was uploaded on 03/22/2011 for the course OCS 1005 taught by Professor Condrey during the Spring '08 term at LSU.

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Test 1 Study Guide - Edwards 1 Oceanography Test 1 Study...

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