The main reason is because of the cold temperatures
Answer:
The study of Geography is made more manageable by dividing the world into units.
Explanation:
Convection currents occur in the MANTLE. The mantle is the second layer of the earth after the crust. The mantle is approximately 2900 km thick. Convection currents are triggered or fueled by the heat from the Earth's core.
The part of the mantle closest to the core gets heated. It then becomes less dense than the layers above so it rises. When this rising plume interacts with the crust it cools and becomes more dense than the layers below and so it sinks and this circular motion continues to form convection currents.
About 70% of the Earth's freshwater is found in the form of ice caps and glaciers -it is frozen. Out of this, the majority is actually in one place: covering the continent of Antarctica.
One could argue that there is
more water in the oceans, but it's not fresh water- it's salty water, so it's not good to drink.
