HOW FAST DOES THE EARTH MOVE?

The earth has two motions – it spins on its own axis and it orbits around the Sun. Its rotation about an axis causes the rising and setting of the sun, moon, and stars and the changes from day to night. One complete turn of the earth actually takes 23 […]

HOW DANGEROUS ARE WHIRLPOOLS?

HOW DANGEROUS ARE WHIRLPOOLS? Whirlpools occur when two opposing currents meet. They cause the water to spin round very rapidly. Huge whirlpools at sea are normally caused by powerful tides. The most famous whirlpool in the Maelstrom, which appears between two islands off the coast of Norway. Sometimes this whirlpool […]

HOW DO AIRPLANES FLY?

As an airplane moves through the air, the air passes over the surface of its wings. These wings are shaped with a curved top surface and a flatter lower surface, which means that air passing over the top of the wing has to travel a little faster than that below […]