Which continent broke away from Pangea first?

Which continent broke away from Pangea first?

About 200 million years ago, the supercontinent began to break up. Gondwana (what is now Africa, South America, Antarctica, India and Australia) first split from Laurasia (Eurasia and North America). Then about 150 million years ago, Gondwana broke up.

Which scale has 12 levels of intensity?

Modified Mercalli Intensity Scale

What are the 3 types of deformation?

When a rock is subjected to increasing stress it passes through 3 successive stages of deformation. Elastic Deformation — wherein the strain is reversible. Ductile Deformation — wherein the strain is irreversible. Fracture – irreversible strain wherein the material breaks.

What are the main causes of deformation?

Deformation is caused by stress, the scientific term for force applied to a certain area. Stresses on rocks can stem from various sources, such as changes in temperature or moisture, shifts in the Earth’s plates, sediment buildup or even gravity.

What are 2 types of deformation in Earth’s crust?

These can be separated into three types: normal faults, which are when extensional forces cause the Earth’s crust to break and the rock drops lower; reverse faults, which are when compression of the Earth’s crust causes rock to be raised above the fault line; and strike-slip faults, which occur with lateral movement of …

What 2 types of deformation are there?

Types of deformation

  • Elastic deformation.
  • True stress and strain.
  • Plastic deformation.
  • Fracture.

What are examples of deformation?

When rocks are stressed, the resulting strain can be elastic, ductile, or brittle. This change is generally called deformation. Elastic deformation is a strain that is reversible after the stress is released. For example, when you stretch a rubber band, it elastically returns to its original shape after you release it.

What is ductile deformation?

Ductile deformation involves the production of large, open folds in the sediments or rocks in front of an advancing glacier, which may develop into overfolds or begin to undergo internal thrusting due to continued ice advance.