Ch. 2, sec. 2 Water and LandformsPresentation Transcript
Bodies of Water and Landforms Ch. 2, Sec. 2
Oceans and Seas
The ocean is a connect body of salt water that covers 71% of the earth
Divided into 4 sections: Atlantic, Pacific, Indian and Arctic
Currents – act like rivers flowing through the sea
Waves – Swells or ridges produced by winds
Tides – regular rises and falls of the ocean created by the gravitational pull of the moon or the sun
Continuous circulation of water between the atmosphere, the oceans and the earth
1-water evaporates 2-water exists as vapor in atmosphere 3-vapor cools, condenses and falls back to earth 4-water soaks into ground
Water held in the pores of rocks
Water table – level at which the rock is saturated
The water table isn’t constant. It raises or lowers depending on seasonal recharge from rain and also from how much is pumped out.
Lakes, Rivers and Streams
Lakes hold > 95% of earth’s fresh water
Result of glacial action
Salt water lakes result from surface changes that cut water off from the sea
That’s because the water is so much denser than you that it makes you naturally buoyant. Just don’t get the water in your eyes. It’ll sting.
Lakes, Rivers and Streams
Rivers and streams flow through channels and move water to or from a larger body of water
An area drained by a major river and its tributaries is a drainage basin
The point at which the edge of the continent drops off to the deep part of the ocean.
Relief – the difference in elevation of a landform from its lowest point to its highest point The bigger the difference, the greater the relief.
4 categories: mountain, hills, plains, and plateaus
Topography is the combination and distribution of different landforms in an area
Island – a body of land surrounded by water
Swamp – a lowland region that is saturated by water
Strait – a narrow channel connecting 2 larger bodies of water
Delta – a triangular area of land formed from deposits at the mouth of a river
Oasis – a spot of fertile land in a desert, fed by water from wells or underground springs
Plateau – a broad, flat area of land higher than the surrounding land
Prairie – a large, level area of grassland with few or no trees
Steppe – a wide, treeless grassy plain
Mountain – natural elevation of the earth’s surface with steep sides and greater height than a hill
Valley – low land between hills or mountains
Glacier – a large ice mass that moves slowly down a mountain or over land
Cataract – a step-like series of waterfalls
Cliff – the steep, almost vertical edge of a hill, mountain or plain
Group Landform Project!!!
In your assigned group, work together to create a map of an imaginary continent on your piece of construction paper. This is a physical map only, so your group will not need to include borders or cities.