Tropical cyclones

Cyclones are large areas of swirling air with clouds and precipitation being formed inside.

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Weather fronts

When masses of cold and warm air meet, weather fronts develop.

Warm front, cold front

Cold and warm fronts are formed where bodies of cold and warm air meet.

The Gregorian calendar

Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is...

Milky Way

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

Karst region (intermediate)

Karst formations include dolines and dripstones.

The water cycle (intermediate)

Water on Earth is in a continuous state of change. The water cycle includes processes...


Waves play an important role in forming the coast.


The last Ice Age ended about 13 thousand years ago.

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