Question

state the theory of the continental drift

Answer 1

In 1915, the German geologist and meteorologist Alfred Wegener first proposed the theory of continental drift, which states that parts of the Earth's crust slowly drift atop a liquid core. The fossil record supports and gives credence to the theories of continental drift and plate tectonics. 

Wegener hypothesized that there was a gigantic supercontinent 200 million years ago, which he named Pangaea, meaning "All-earth". 

Pangaea started to break up into two smaller supercontinents, called Laurasia and Gondwanaland, during the Jurassic period. By the end of the Cretaceous period, the continents were separating into land masses that look like our modern-day continents. 

Wegener published this theory in his 1915 book, On the Origin of Continents and Oceans. In it he also proposed the existence of the supercontinent , and named it (Pangaea means "all the land" in Greek). 

Answer 2

Answer:

Alfred Wegener 1880-1930 a German meteorologist and geologist, was the first person to propose the theory of continental drift. In his book, Origin of Continents and Oceans, he calculated that 200 million years ago the continents were originally joined together, forming large supercontinent. He named this supercontinent Pangaea, meaning All-earth.

The Earth's crust is not a single continuous layer. It is made up of a number of gigantic pieces like a huge jigsaw puzzle.

Each piece is called a crustal plate. Currents of molten rock rise up through the mantle like boiling water in a saucepan.

These form convection cells that drive the movement of the plates so that they are continuously moving away or towards each other. Geologically, the most important things happen at the plate boundaries, including most of the earthquakes, volcanoes, igneous rocks, major metamorphism, and mountain building processes.