Continental Drift
Many early mapmakers thought Earth’s continents had moved based on
a. Fossil evidence
b. matching coastlines
c. climatic data
d. plate boundary locations
b. matching coastlines
Which scientist proposed the idea that the Ocean’s floor moves like a conveyor belt?
a. Charles Darwin
b. Harry Hess
c. Alfred Wegner
d. Issac Newton
Tectonic Plates interact at places called plate
A. regions
B. reversals
C. boundaries
D. subductions
C. boundaries
Earth's crust and the "rocky"upper mantle make up the
a. asthenosphere
b. lithosphere
c. titanophere
d. atmosphere
b. lithosphere
Most scientists at the time rejected Wegener’s hypothesis of continental drift because he
A. would not state his hypothesis publicly
B. insisted that Earth’s axis of rotation had changed
C. couldn’t explain how or why the continents moved
D. had collected little evidence to support his hypothesis
c. couldn’t explain how or why the continents moved
All of the following are considered bodies of evidence for continental drift except
a. fossil evidence
b. magnetic stripes
c. climatic evidence
d. similar rock formations
b. magnetic strips
All of the following are considered key bodies of evidence for seafloor spreading except
a. Molten material (strangely shaped rocks)
b. Magnetic stripes
c. Fossils along the seafloors
d. Drilling samples
c. Fossils along the seafloors
The Himalayas are an example of
a. Convergent boundaries
b. Transform boundaries
c.Divergent boundaries
d. Convection currents
a. Convergent boundaries
Tectonic plate movement is caused by
a. solar radiation
b. seafloor spreading
c. convection currents
d. continental drift
c. convection currents
What technology was primarily used to map the ocean floor in the 1950s?
a. Satellite mapping
b. Sonar
c. Thermal Imaging
d. Ground Penetrating Radar
b. Sonar
Based on observations of fossils of Glossopteris, Wegener concluded that
a. Magnetic reversals had occurred in Earth’s past.
b. Earth’s continents were never joined.
c. The plant grew only in the tropics.
d. Continental rocks containing these fossils had once been joined.
D. Continental rocks containing these fossils had once been joined
Compared to ocean crust near deep-sea trenches, crust near ocean ridges is
a. younger
b. the same age
c. older
d. magnetically reversed
a. younger
The Philippines archipelago is an example of
a. oceanic-oceanic convergent boundary
b. oceanic-oceanic divergent boundary
c. oceanic-continental convergent boundary
d. oceanic-continental divergent boundary
a. oceanic-oceanic convergent boundary
What drives convection currents in the asthenosphere?
a. the lithosphere
b. climatic variance
c. seafloor expansion
d. Earth's core
d. Earth's core
Each cycle of spreading and intrusion of magma during seafloor spreading results in
A. new ocean crust
B. magnetic reversals
C. plates colliding
D. subduction
A. new ocean crust
Explain how similar rock formations found on different continents helps to strengthen the theory of continental drift
Similar rock formations, such as the Appalachians found in the U.S. and mountains in the UK and North Africa, help to explain continental drift due to them having similar compositions and isometric dating (age).
What process occurs at deep ocean trenches?
a. Subduction
b. Radiation
c. Condensation
d. Transmission
a. Subduction
Mt. St. Helens is an example of a
a. oceanic-oceanic convergent boundary
b. oceanic-oceanic divergent boundary
c. oceanic-continental convergent boundary
d. oceanic-continental divergent boundary
c. oceanic-continental convergent boundary
Extensive earthquake activity is a key feature of
a. divergent plate boundaries
b. convergent plate boundaries
c. megalithic plate boundaries
d. transform plate boundaries
d. transform plate boundaries
The fossil found across the most continents was the
a. Lystrosaurus
b. Glossopteris
c. Cynognathus
d. Mesosaurus
b. Glossopteris
Give and explain an example discussed in class of climatic evidence for continental drift. (Multiple examples to choose from).
You can discuss:
Coal deposit locations
Glacial Scarring
Tropical plants found in Antarctica
Explain with detail how magnetic stripes on the ocean floor are considered
The answer should explain how Earth has a magnetic field, that is reverses every 780,000 years (roughly), that isochron maps along with magnetometers helped reveal the magnetic fields on the seafloor, and that alongside ocean ridges, and that the magnetic patterns on either side of a deep-sea trench are mirror images of each other.
Identify two key differences between oceanic and continental crust
Oceanic: Thinner, more dense
Continental: thicker, less dense
Explain the concept of Slab Pull
Slab pull is the force of a dense, subducting tectonic plate sinking into the mantle and pulling the rest of the plate along with it
Explain the concept behind ridge push
Ridge push is the force of magma at mid-ocean ridges pushing older, cooler crust away from the ridge crest.