Whick mineral can be found in all samples of rhyolite and andesite

Which barrier to economic development is shown in the following examples?

Under which condition below would u expect a coarse-grained intrusive rock like diorite to form?

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