Canadian shield is composed of Precambrian rocks that cover 2.8 million square miles.
Answer:
Drought- A prolonged period of abnormally low rainfall, leading to a shortage of water.
Desertification- The process by which fertile land becomes desert, typically as a result of drought, deforestation, or inappropriate agriculture.
Explanation:
Answer:
Barter system had many deficiencies such as
★Lack of double coincidence of wants
★Common measure of value
★Indivisiblity of commodities
★Difficulties of storing wealth
So we don't use barter system anymore
3. As the sea-ice cover of the arctic and southern oceans shrinks, the albedo of the earth's surface decreases.