Which two pieces of information do you need to calculate the richter magnitude of an earthquake?.

It is reasonable to assume that nations with a low total fertility rate (tfr) and a modest amount of population growth are in

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

There is only one climate type in motion across the world at a time