What is the primary similarity responsible for high volumes of magma erupted in both iceland and hawaii? select one: a. both islands overlie mid-oceanic ridges a. both islands overlie mid-oceanic ridges c. both volcanic centers developed on oceanic plates d. both volcanic centers are above hotspots e. all of these

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel

What is the largest river in the united states?