1) An index fossil must have been abundant and ... a) lived a short period of time b) large sized c) mutated due to radiation 2) Rocks and fossils found at the _________ are younger than those found at the __________. a) top, bottom b) bottom, top c) middle, top 3) About _________ % off all life forms disappear during a mass extinction. a) 50-60 b) 70-75 c) 80-85 4) A rock layer that cuts through other rock layers is _____________ than the layers a) older b) younger c) stronger 5) Rock strata means a) rock intrusions b) rock erosion c) rock layers 6) Di means _____. Divergent plates __________. a) 2, separate together b) 2, separate apart c) 2, collide together 7) Uniform means ... a) to be different b) to work together c) to be the same 8) Co means _____. Convergent plates___________. a) separate together b) collide apart c) compress together 9) The cause of plate tectonics (is) or (are) a) convection in the mantle b) convection on the crust c) ocean circulation 10) A delta is formed when a) a lake floods a plain b) a river drops of sediment in an ocean c) sediments melt out of a glacier

Geologic Time and Fossils

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