Sci 7 – Earth’s Crust 8.4
Evidence for a New Theory
Evidence for a New Theory
Directions: READ pages 226-229 in your text book BC Science Probe 7 and answer the
following questions;
1.
Use your textbook, the internet or a dictionary to provide definitions for the
following terms; (1 mk each)
Magnetite
Plate Tectonics
Oceanic Crust
Continental Crust
2. On a separate piece of paper, answer the following questions using COMPLETE
SENTENCES;
a.
In your own words, describe what the Mid Ocean Ridge is and explain why
scientists believe that the ocean floor of the Mid-Atlantic is not as old as they
thought.. (2 mks for quality of response and inclusion of details)
b. In your own words, describe how geologists use magnetite to find evidence of
how the magnetic fields of the Earth have reversed over millions and millions of
years. (2 mks for quality of response and inclusion of details)
c.
In your own words, describe the difference between plate tectonics and
Wegener’s theory of continental drift. (2 mks for quality of response)
3. Color and Label the continental and oceanic plates on the following
diagrams. You will also have to create a key that demonstrates which
plates are spreading apart and which plates are coming together.
You will be marked out of 5 for your ability to complete the diagrams,
with all relevant information in a neat and colorful fashion.
Total: ____ 15