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Copy of Processes That Shape Ocean Basin and Continental Drainage

By: Christine, Jan and Kenji

mariam desouki

on 12 June 2014

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Transcript of Copy of Processes That Shape Ocean Basin and Continental Drainage

Section 2.3
Processes That Shape Ocean Basins and Continental Drainage
The solid outer part of the Earth is called the
The lithosphere is made out of rocks that are broken into huge plates. Some plates would
move toward each other
others would move apart from one another
and some would
move alongside in opposite directions
The Theory of
Plate Tectonics
states that the surface of the Earth is divided into huge moving plates.
Volcanic Islands
are formed when

volcanoes that grow up all the way from the ocean's floor.
are underwater volcanoes that do not come all the way to the ocean's surface.
form when two plates are moving toward each other. The thinner oceanic plate is pushed down below the thicker continental plate.
Mid-ocean ridges
form where molten rock pushes up from the interior of Earth. On either sides of the ridges, two different plates would slowly move away from each other as the molten rock hardens to a new crust.
continental shelves
are shallow areas around the edges of the continent. They are mainly sedimentary deposits of materials eroded off the continents.
The changing lithosphere also affects the
major drainage
of our continents; it has been occurring for many years.
Continental Divide
sets the pattern for the direction in which rivers flow.
The same forces that shaped the ocean basins build the
Rocky Mountains
At the edge of the continent, two plates would meet. When they push against each other, the continent's surface winkles and pushes up. The Rockies and other folded mountains were made this way.
Plate tectonics formed many mountain ranges,
those mountain ranges have helped to shape continental drainage systems
But another major force has carved much of North America's surface to create lakes and river valleys, this force is
Glaciers are large moving bodies of ice. Glaciers that cover vast areas are called
Continental Glaciers
, or
ice caps
As glaciers move, some pieces of rock become imbedded in the ice. These pieces range from small rocks to large boulders.
Repeated glaciation has worn down mountains that had tall sharp peaks into rounded hills.
Many lakes in Canada were formed by the action of glaciers scouring out depressions in the land. i.e.)

are formed when large chunks of ice left behind by the glaciers that melted away.
Movement of the glaciers depends on the climate
. In a cooler climate, not a lot of melting happens. The snow and ice keep building up and the glaciers continue to move forward or advance. If the climate is warmer more melting occurs and the glacier will stop moving.
form from rocks and gravel that build up on the sides and edges of the glacier. When the edges melt, large deposits form.
form when glaciers melt, it flows in tunnels under the ice. The melting releases sand and gravel in the glacier.
are small hills with a distinct tear drop shape. They form when a glacier move over moraines that had earlier formed. The tip of the drumlin points in the direction the glacier is moving.
Continental Drainage Systems
Recognizing Glacial Effects
Made by:
Full transcript