The professor of geology at Benha University Zakaria Hamimi, discussed concerns of Egypt entering an earthquake zone ...

It becomes so great that the energy is released, which creates a shock wave - an earthquake. If an earthquake is beneath the ocean it can create a series of huge waves, called a tsunami.

Save guides, add subjects and pick up where you left off with your BBC account. Composite volcanoes are the most common type of volcano. They can have violent eruptions and can grow bigger as ...