Science Q2T1 2015 Part 2 Question Preview (ID: 27083)


Ch. 6 Plate Tectonics. TEACHERS: click here for quick copy question ID numbers.

Early studies of the ocean floor helped to develop the theory of plate tectonics because they showed that
a) the age of oceanic crust increases with distance from a mid-ocean ridge
b) oceanic crust is oldest near the center of a mid-ocean ridge
c) oceanic crust is younger near a deep-ocean trench
d) oceanic crust is nearly the same age as continental crust

Subduction occurs
a) along a transform boundary in the ocean
b) when two oceanic plates pull apart
c) when two continental plates converge
d) when an oceanic plate and another plate converge

Which of these did Wegener use to support his theory of continental drift?
a) similar rocks and similar fossils on different continents
b) sea-floor spreading and similar rocks on different continents
c) convection currents in the asthenosphere and sea-floor spreading
d) fossils from ancient organisms and convection currents in the asthenosphere

Oceanic crust at a mid-ocean ridge is
a) younger than crust near a trench
b) older than crust near a trench
c) much older than continental crust
d) about the same age as continental crust

Scientists think that the main driving force of plate tectonics is
a) ridge push
b) slab pull
c) convection in the lithosphere
d) convection in the asthenosphere

Which of the following is also known as a spreading center?
a) transform boundary
b) divergent boundary
c) convergent boundary
d) convection boundary

Earth's magnetic reversals are recorded in
a) sea-floor rock
b) the mantle
c) deep-ocean trenches
d) the asthenosphere

At transform boundaries, two plates
a) pull away from each other
b) push against each other
c) scrape past each other
d) do not move in any direction

The Alps are forming as a result of the European and African plates pushing against each other. This is an example of
a) oceanic-oceanic subduction
b) oceanic-continental collision
c) oceanic-continental subduction
d) continental-continental collision

Many scientists rejected continental drift when it was first proposed because
a) studies of the ocean floor revealed its younger age
b) Wegener had no evidence to explain the existence of Pangaea
c) reversals in Earth's magnetic field had not yet occurred
d) Wegener could not explain how Earth's continents moved

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