or log in
Waterfalls form where the river flows over a steep precipice in its course.
Lateral compressive forces cause rocks to form folds. This is how fold mountains are formed.
A glacier is a large body of ice that forms from snow, and is in constant, slow motion.
A glacier is a large body of ice in constant, slow motion down a hillside.
Tsunami waves are very high waves of immense destructive power.
One third of the continents is covered with desert. Today, desertification is a growing problem.
Lightning is a sudden electrostatic discharge accompanied by a sound known as thunder.
The boundaries of tectonic plates can be seen on the seafloor.