In which Earth layer are most convection currents that cause seafloor spreading thought to be located? A) crust

B) asthenosphere

C) outer core

D) inner core

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

Upload your prewriting graphic organizer. you may use any style you wish: chart, outline, web, list.

When the soviets created the borders of their central asian and caucus republics, the paid little attention to where each region’s ethic group lived. ethnic-related disputes exist along every sherd boundary in central asia. true false