Limestone

It is a sedimentary rock with high calcium carbonate content.

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Continental drift

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Tornadoes

Short-lived but extremely powerful tornadoes can cause a great deal of damage.

The process of physical and chemical weathering

Upon physical weathering the rock only falls into pieces, whereas during chemical weathering its...

The atmosphere

The atmosphere surrounds us everywhere on this planet. We take its presence so much for granted...

Milky Way

The diameter of our galaxy is about 100,000 light years; it contains more than 100...

Weather and climate

Climate is the typical weather of a certain region that changes practically only on a geological...

El Niño

A periodic climate pattern that occurs across the tropical Pacific Ocean every five years.

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