Earth Science matergardens地球科学 matergardens.pptVIP

Earth Science Chapter 1-2, 1-3 1-4 The Earth System Earth System: 4 main parts 1. Atmosphere 2. Hydrosphere 3. Lithosphere 4. Biosphere Atmosphere The layer of gases that surround and form an envelope around the Earth. Consists of several gases Nitrogen – 78% Oxygen – 21% CO2, H2O, others – 1% Lithosphere Earths solid, rocky outer layer The continents, islands and ocean floors Hydrosphere All of the water present on the planet Oceans, lakes, streams, ice caps, snow, glaciers, etc. Biosphere That area of the land, water and air that contains life! The Earth’s Surface Topography: The shape of the land. The topography of an area includes the areas elevation, relief, and landforms. Elevation - Relief Elevation -height above sea level Relief - difference between the highest and the lowest points of an area Landforms 3 main types: plains, mountains plateaus. Plains: made up of flat or gently rolling land with low relief Mountains: made up of high elevation and high relief. Plateaus: high elevation and a more or less level surface Earth’s Grid – Equator Prime Meridian Prime Meridian goes thru Greenwich, England Equator is half way between the north south pole Latitude Longitude Latitude: the distance north or south of the equator Longitude: the distance east or west of the prime meridian Both latitude longitude are measured in degrees Latitude Longitude They provide information on the elevation, relief, and slope of the ground surface You must familiarize yourself with the maps scale and symbols and interpret the maps contour lines. closely spaced contour lines indicate steep slopes. closed loop with no other contour lines inside it indicates a hilltop. V-shaped contour lines pointing uphill indicate a valley. Topographic Maps Reading a Topo Map Contour lines Thin lines Contour interval Spaces between Index contour Thick lines Making a Topo Map