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What forces shape the Earth?

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Presentation on theme: "What forces shape the Earth?"— Presentation transcript:

1 What forces shape the Earth?

2 Internal forces Internal forces Core-center of the earth
Mantle-surrounds the core and has several layers Magma-molten rock which forms in the mantle Crust-thin layer of rock at the earth’s surface.

3 Bodies of Water Oceans and Seas
One large ocean but geographers divide it into four main parts: Atlantic Ocean, Pacific Ocean (Largest), the Indian Ocean, and the Arctic Ocean

4 Bodies of Water (cont) Lakes, rivers, and streams Ground water
Water that is held by the soil, and some flows into the pores of rock below soil

5 Landforms Landforms are naturally formed features on the surface of the earth. Oceanic landforms The floor of the ocean has ridges, valleys, canyons, and plains just like the earth’s surface.

6 Types of Maps Physical maps-help you see the types of landforms and bodies of water found in a specific area. On a physical map color, shading, or contour lines are used to indicate elevation or altitude. Political maps-show features on the earth’s surface that humans created. Cities, states, territories, or countries are examples of a political map. Topography maps-shows the landforms with their vertical dimensions and their relationship to other landforms.

7 Vocabulary Plateau-a large flatland with one steep side and little relief Mesa-land formation less extensive than a plateau but has steep walls and a relatively flat top. Plateau and Mesa mean almost the same thing

8 Vocabulary continued Isthmus-a narrow piece of land that connects two landmasses Island-a tract of land completely surrounded by water, and not large enough to be called a continent

9 Vocabulary Volcano-An opening in the earth's crust through which molten lava, ash, and gases are ejected. Flood plain-the flat area bordering a river, composed of sediment deposited during flooding

10 Vocabulary River mouth
Peninsula-a narrow strip of land projecting into a sea or lake from the mainland Steppe-an extensive grassy plain usually without trees

11 Vocabulary Butte-A steep-sided hill with a flat top, often standing alone in an otherwise flat area. A butte is smaller than a mesa. Prairie-a treeless grassy plain of the central US and S Canada

12 Vocabulary Delta-the flat alluvial area at the mouth of some rivers where the mainstream splits up into several distributaries ex. Mississippi Delta Plateau-a wide mainly level area of elevated land

13 Vocabulary Cliff-a high, steep, or overhanging face of rock
Oasis-a fertile patch in a desert occurring where the water table approaches or reaches the ground surface Cataract-a large waterfall or rapids

14 Vocabulary Marsh-An area of soft, wet, low-lying land, characterized by grassy vegetation and often forming a transition zone between water and land.

15 Vocabulary Harbor-A sheltered part of a body of water deep enough to provide anchorage for ships. Protects from wind, waves, and currents

16 Vocabulary Sea Level-the level of the surface of the sea with respect to the land, taken to be the mean level between high and low tide, and used as a standard base for measuring heights and depths


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