or log in
When masses of cold and warm air meet, weather fronts develop.
Cold and warm fronts are formed where bodies of cold and warm air meet.
Developed nearly 500 years ago, it is a variant of the Julian calendar. Today it is...
The diameter of our galaxy is about 100,000 light years; it contains more than 100...
Karst formations include dolines and dripstones.
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.