1) Which crust is the thickest? a) Oceanic b) Continental c) They are the same 2) Which crust is the most dense? a) Oceanic b) Continental c) They are the same 3) What is a constructive boundary? a) plate boundary where new crust is formed b) A plate boundary where crust is destroyedb c) a plate boundary where plates move apartp 4) What is an ocean trench? a) a deep channel in the ocean floor where crust is forming b) a deep channel in the ocean floor where crust is sinking 5) A layer of plastic semi-solid rock in the lower mantle on which the Earth's tectonic plates move is called the ... a) crust b) lithopshere c) asthenosphere 6) A huge wave in the ocean caused by an earthquake occurring on the sea floor is called... a) earthquake b) tidal wave c) tsunami 7) A place where extremely hot material from inside the Earth erupts at the surface is called .... a) volcano b) vent c) crater 8) Subduction is... a) when one plate collides with another plate b) when one plate sinks below another plate c) when 2 plates collide and create uplift 9) A seismometer measures.. a) s and p and surface waves b) the movement of the ground during an earthquake c) all of the above 10) Carbon dating is unreliable for objects older than about 30,000 years, which element is better suited to older remains? a) uranium-thorium b) nitrogen

Plate tectonics

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