Continental rifts typically contain large amounts of basalt and rhyolite. Your answer to Question 1.b., in Exercise 5.10 explained the origin of the basalt, but fractional crystallization of mafic magma can produce only a very small amount of felsic magma. Explain the origin of the large volumes of felsic magma in continental rifts.

Which state has the highest killing rate?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite

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