1) Convection Currents in which layer causes the plates to move a) lithosphere b) asthenosphere c) inner core 2) Al Wegener proposed the theory of a) plate tectonics b) continental drift c) seafloor spreading 3) Seafloor spreading may explain why... a) mountains are building b) continents are drifting apart c) both 4) The idea that continents were once all joined together but were separated over millions of years is called.. a) continental drift b) the theory of plate tectonics c) law of conservation 5) Convergent plates .... a) pull apart b) slide past with great friction c) compress together 6) Cracks in Earth's bedrock where plates may suddenly move are called a) plates b) earthquakes c) faults 7) The energy produced by an earthquake are called  a) Rwaves b) strike-slip faults c) seismic waves 8) The mantle is moving because... a) convection currents are in motion b) the core is cooling off c) the outer core is producing energy 9) Divergent plates pull apart at a) fault valleys b) rift trenches c) mid-ocean ridges 10) Fault-block mountains occur at __________plates boundaries a) convergent b) divergent c) transform

Plate Tectonics

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