Alfred Wegener 1880-1930. How Wegener Proved His theory Continental Fit Matching Fossils Matching Mountains Sea Floor Age.

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Presentation transcript:

Alfred Wegener

How Wegener Proved His theory Continental Fit Matching Fossils Matching Mountains Sea Floor Age

Mesosaurus

Describe what is happening in this photograph. Time Two countries Plate movements Everest

What causes plates to move Caused by thermal convection currents 1. Hot rock moves like tar 2. Hot interior of the earth

Types of plate margins Divergent – constructive Plates pull apart Hot magma released to the surface New oceans can form – mid atlantic ridge Continents pull apart at 2.5 cm per year.

Types of plate margins Convergent - Destruction of Crust When two plates collide, one plate travels beneath another. This is known as subduction

Types of Convergent Plates Oceanic – Cceanic Convergence Oceanic - Continental Convergence Continental – Continental Convergence

Oceanic – Oceanic Plates The smaller plate slips below the thicker plate A Trench forms where the plate subducts Example – The Mariana Trench where the Pacific and Phillipines plates collide

Oceanic – Continental Plates The oceanic crust is heavier and sinks beneath the continental crust The continental plate deforms forming a mountain range Exampe Nazca Plate and South American Plate converge to form the Andes

Andes Mountains Oceanic – Continental Plate Convergence

Continental - Continental The two plates are very light Neither plate subducts They fold upwards to form a mountain range Example the Indian Plate and the Eurasian Plate began to form the Himalayas 50 million years ago

Red Sea

Africa Pulling Apart. Separating Plates form the Agen and the Red Seas