A topographic map displays sea level readings for different locations.
ex. color shows depth
Rainwater and rivers/streams
The 60th parallel north is a circle of latitude that is 60 degrees north of Earth's equator.
vacuum distillation
Traditionally, the best way of taking salt out of water has been through vacuum distillation. The salt water is enclosed at a low pressure to reduce its boiling point, making it easier to vaporize to separate the salt from the water.
the salt water is heated or the water is allowed to evaporate,the water vapour is collected rather than being lostthe water.vapour is condensed to form pure water/fresh water, salt is left behind and can be used for other purposes.
