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Describe Continental Drift

Alfred Wegner suggested that all the continents on the earth must have been all one at one point in time. He said that millions of years ago the continents must have collided creating a super continent which was known as Pangaea. His only proof was that the continents are in constant motion.

Describe plate tectonics

Canadian named Tuzo Wilson, helped spark new interest in continental drift. The theory states that the earths outer crust is broken into huge played these played are made up of rock and drift all over the globe. Over longer periods of time, the plates changed in size and are added to, crushed together or pushed back.

What are the different types of plate movement.

Divergence, convergence, lateral slipping

What is divergence

The movement of two plates away from each other. Sea floor spreading

Convergence

Movement of plates toward one another. When two plates collide mountain ranges are created.

Lateral slipping

Occurs when two plates move sideways against each other. Create a tremendous amount of friction.

Precambrian Era

Began when earth was first formed. Lasted 4 billion years. 87% of earths history. First multi called and single called organisms. Canadian Shield was formed.

Palaeozoic Era

Periods when large parts of North America are covered by shallow seas. Appalachians formed. Age of amphibians and fish. First plants and animals appear on land.

Mesozoic era

Formation of Rocky Mountains begin. Shallow seas in the interior of North America at various times. Age of reptiles such as dinosaurs. First flowering plants.

Cenozoic

Ice sheets covered much of North America. Continents take on their present shape. Formation of Rocky Mountains completed. Human beings develop. Age of mammals.

Types of precipitation.

Conventional, cyclonic, orographic.

Rock formation

Sedimentary, igneous, metamorphic, magma, deciduous and coniferous.