Shields are:.a. composed of rocks that were metamorphosed during recent (less than a million years ago) mountain-building events. b. composed of some of the oldest rock on the Earth. c. rarely exposed at the Earth's surface and contain blueschist. d. composed of extensive areas of sedimentary layers laid down on lava flows.

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.

The oil and gas found in the middle east are regulated by a. organization of petroleum exporting countries b. southwestern asian oil refineries c. north atlantic treaty organization

The majority of australians live in the w. urban rimx. tropical northy. outbackz. sunshine coast