Download 10. Continental Drift

Name: ____________________________________
1. Compared to Earth’s crust, Earth’s core is believed to be
1. less dense, cooler, and composed of more iron
2. less dense, hotter, and composed of less iron
3. more dense, hotter, and composed of more iron
4. more dense, cooler, and composed of less iron
5. What is Earth’s inferred interior pressure, in millions of
atmospheres, at a depth of 3500 kilometers?
1. 1.9 3. 5500
2. 2.8 4. 6500 6. Earth’s outer core is best inferred to be
2. At a depth of 2,000 kilometers, the temperature of the stiffer
mantle is inferred to be
1. 6,500°C 3. 3,500°C
2. 4,200°C 4. 1,500°C
3. Which statement correctly describes the density of Earth’s
mantle compared to the density of Earth’s core and crust?
1. The mantle is less dense than the core but more dense
than the crust.
2. The mantle is less dense than both the core and the
crust.
3. The mantle is more dense than the core but less dense
than the crust.
4. The mantle is more dense than both the core and the
crust.
4. The diagrams below show patterns of convection currents
under the Mid-Atlantic Ridge. Many scientists believe that
convection currents in the mantle between South America and
Africa caused the separation of the two continents and the
formation of the Mid-Atlantic Ridge. Which diagram best
represents the currents described in this theory?
1. 1. liquid, with an average density of approximately 4 g/cm3
2. liquid, with an average density of approximately 11
g/cm3
3. solid, with an average density of approximately 4 g/cm3
4. solid, with an average density of approximately 11 g/cm3
7. The primary cause of convection currents in Earth’s mantle is
believed to be the
1. differences in densities of earth materials
2. subsidence of the crust
3. occurrence of earthquakes
4. rotation of the Earth
8. Fossils of organisms that lived in shallow water can be found
in horizontal sedimentary rock layers at great ocean depths. This fact is generally interpreted by most Earth scientists as
evidence that
1. the cold water deep in the ocean kills shallow water
organisms
2. sunlight once penetrated to the deepest parts of the
ocean
3. organisms that live in deep water evolved from species
that once lived in shallow water
4. sections of the Earth's crust have changed their
elevations relative to sea level
9. Which graph best shows the inferred density of Earth’s
interior as depth increases from the upper mantle to the lower
mantle?
2. 1. 3. 2. 4. 3. 4. 10. Which statement best supports the theory of continental
drift?
1. Basaltic rock is found to be progressively younger at
increasing distances from a mid-ocean ridge.
2. Marine fossils are often found in deep-well drill cores.
3. The present continents appear to fit together as pieces
of a larger land mass.
4. Areas of shallow-water seas tend to accumulate
sediment, which gradually sinks.