14. Canada's northern region * a. accounts for most of the factory production of the country

b. consists mostly of sparsely populated rural areas

c. contains most of the country's infrastructure
d relies heavily on the great lakes for trade with the U. S.

Based on their location in the atmosphere, the layers are able to have their own special characteristics. for example, most weather occurs in the troposphere. what occurs in each of the other layers?

Use your vocabulary words to complete the sentences below. more of the world's population is now concentrated in heavily populated urban areas known as a this is quite a contrast from the past when or native groups were either farmers or — hunters and gatherers who moved between places in search of food. advanced technology has led to the integration of world economics and cultures, in the world's more developed countries. this integration requires , the responsible use and management of natural resources.

How many time zone are there on earth