Earth's Systems
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Objective
I can analyze evidence, such as magnetic patterns in undersea rocks, to understand how continental and oceanic crusts move and change over time.
Part 1 of 3
Warm-up video
CrashCourse · 10:58Vetted channel
We don't generate video — this one is by CrashCourse on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 3
Practice
7 questions
Describe the evidence that Alfred Wegener used to support his theory of continental drift. Why was his theory initially rejected by the scientific community?
Explain how the mapping of the ocean floor by Bruce Heezen and Marie Tharp contributed to the development of the theory of plate tectonics. What specific features did they discover?
Part 3 of 3
Exit ticket
Quick comprehension check
“Describe how the magnetic patterns found in undersea rocks provide evidence for the process of seafloor spreading. Explain how changes in Earth's magnetic field polarity are recorded in undersea rocks and what this reveals about the movement of oceanic crust over time. If a symmetrical pattern of magnetic stripes is observed on either side of a mid-ocean ridge, what can you infer about the rate and direction of plate movement?”
Sample answer included in the free materials
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