Download Maintenance Sheet #1

Plate Tectonics Homework—DUE DECEMBER 16th
Name:______________________________
1. How do mid-ocean ridges support both the
idea of continental drift and
the theory of plate tectonics?
2. Which of the following compositional
layers makes up the greatest
percentage of Earth’s mass?
A. Oceanic lithosphere is destroyed at midocean ridges.
B. New crust forms at mid-ocean ridges.
C. Tectonic plates collide at mid-ocean ridges.
D. The crust at mid-ocean ridges is old oceanic
lithosphere.
3. How does fossil evidence support
Wegener’s hypothesis of continental
drift?
A. continental crust
B. oceanic crust
C. the mantle
D. the core
A. Similar fossils found on far apart
landmasses suggest that the
continents were once a single landmass.
B. Fossil evidence suggests that the continents
have always been in their
current positions.
C. No similarities exist between fossils on
different continents.
D. Plant and animal fossils show evidence of
changes in Earth’s
polarity.
5. Which of the following geologic features
forms as a result of tension?
A. an anticline
B. a syncline
C. a normal fault
D. a reverse fault
7. The sinking of Earth’s crust to lower
elevations is called
A. rebound.
B. subsidence.
C. uplift.
D. deformation.
Diagram goes with #9--------------------------
4. Most of the world’s folded mountains
formed as a result of
A. oceanic-oceanic separation at mid-ocean
ridges.
B. continental-continental separation at rift
zones.
C. continental-oceanic collision at
subduction zones.
D. continental-continental collision at
convergent boundaries.
6. Scientists think that all of the presentday continents were once joined
in a single supercontinent called
A. Pangaea.
B. Panthalassa.
C. Laurasia.
D. Gondwana.
8. Sea-floor spreading occurs at which of
the following types of tectonic
plate boundaries?
A. transform
B. convergent
C. divergent
D. strike-slip
9. Which of the following structures is
shown in the diagram to the left if the
bottom layer is the oldest?
A. a monocline
B. a fault
C. an anticline
D. a syncline