ENVS201 Exam 1 Study Guide.docx - ENVS201 Exam 1 Study...

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ENVS201- Exam 1 Study Guide1.The Role of Science is to inform society. The mission of universities and colleges is to provide students with an education and opportunities to advance their knowledge.2.Major Parts of the Earth:a.Atmosphere- needed to provide air to breath, provide protection from the sun’s heat & ultraviolet radiation, and to produce weather & climateb.Hydrosphere- needed to provide water to all living things, sculpt landforms and maintain a stable environmentc.Lithosphere- needed to create surface features like continents & ocean basins andhelps us understand the history and nature of the EarthGas composition of the Atmosphere:Nitrogen- 78%Oxygen- 21%Carbon Dioxide- .03%Rare Gasses- .93%Water vapor-variableAtmospheric Layers:Troposphere- 10 miles up,temp. decreases with elevation, site of violent stormsStratosphere- 20 miles up,temp. increases with elevation, contains the ozone layerMesosphere-40 miles up, temp. decreases with elevationThermosphere- 60 miles up, boundary between Earth & space, makes radio & TV transmission possible, Nitrogen & Oxygen exist as atoms3.Diameter- 8,000 miles Radius: 4,000 miles Circumference: 25,120 miles shape-oblate ellipsoid, flat at the poles Rotation- rotates on its axis in 24hrs, determines the length of a day Revolution- orbits around the sun once per yearSurface features- vast oceans, mountains, plains, valleysAge of the Earth- 4.5 billion years oldEarth’s Interior:Core- 1,400 miles thickoInner core (solid)oOuter core (molten)Mantle- 1,8000 miles thickoLower mantle (mesosphere)oUpper mantle (asthenosphere)Crust (lithosphere) 14-20 miles thickLowest Point- Mariana Trench (-36,204 ft)Highest point-Mt. Everest (29,028 ft)4.Components of Earth’s System:Atmosphere- important because it provides air to breath, protects against the sun and allows climate & weather
Lithosphere- important because it helps understand the history and nature of Earth and produces construct continents &the ocean floorHydrosphere- is important because it includes all the water provided to living organisms and is an integral part of Earth’s surface features and environmentBiosphere- important because life plays a major role in shaping the nature of all aspects of the EarthThe Earth’s system components minus the biosphere are the major parts of the Earth. Themajor parts of the Earth plus the biosphere is the components of the Earth’s system.5.

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