UT Arlington ASTR 1345 - Exam 3 Study Guide (6 pages)

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Exam 3 Study Guide

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Exam 3 Study Guide


Goes through lectures 18-22

Study Guide
University of Texas at Arlington

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ASTR 1345 1nd Edition Exam 3 Study Guide Lectures 18 22 Lecture 18 November 6 Origin of the Solar System What do we know about our Earth The Earth is made of 74 Helium 25 Helium and 1 consisting of heavier elements A cloud gas collapses if it has a low temperature so that the outward thermal pressure is small or high density so gravitational pressure causes the cloud to collapse inwards It also collapses if the disk is rotating The rotation of the Earth would be faster without the Moon Earth developed a permanent atmosphere because speeds imparted to the gases of the second atmosphere by sunlight were not high enough to enable them to leave Earth s gravitational bonds Helium and Hydrogen through geographical change formed volcanoes that created CO2 and those 3 then created toxic water and very primitive bacteria Then the CO2 was converted to oxygen by early plant life How do terrestrial planets and gas giants differ Terrestrial planets are mostly solid have a lower mass slower rotation higher density no rings and fewer moons Gas giants are mostly fluid have a higher mass fast rotation lower density rings and many moons What is the troposphere The troposphere is the lowest level of Earth s atmosphere Which is where all of Earth s weather occurs 75 of the mass of the atmosphere lies in this layer Temperature drops from an average 290K at ground level to 218K at 11 km Convection causes the weather It causes hotter air near the ground to rise and cooler denser air to fall What is the stratosphere The stratosphere is the 2nd layer in Earth s atmosphere in the realm of the ozone layer Temperature increases because of the ozone layer What is the mesosphere Mesosphere is the 3rd layer above the stratosphere Temperature drops to a minimum of 200K What is the ionosphere The ionosphere or thermosphere is the 4th layer above which the Sun s ultraviolet radiation heats and ionizes atoms producing charged particles that reflect radio waves Lecture 19 November 11 Earth and the

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