Which of these best matches a weather condition with its cause? a) blizzard - freezing of water under oceans b) hurricane - underwater shifting of tectonic plates c) thunderstorm - shifting of warm and cool ocean currents d) tornado - meeting of cool and warm air masses on land.

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.

What part did glaciers play in forming the great lakes?

How do oceanographers measure the salinity of ocean water?