Strategies for Answering W.R. Questions Re-write the prompt as questions. Write one question for each part of the prompt that requires an answer. Answer each question. –Begin each answer by restating the question. –Complete the sentence with information that you learned in class. Include any additional information in another sentence. Read your answer. –Does it make sense? –Could someone not in this class understand your explanation? –Does it answer all parts of the question? –Is it written in complete sentences?

Magnetic Stripes

225 mya N S

200 mya S N

150 mya N S

100 mya S N

50 mya N S

Present Day S N

Complete these sentences below your drawings The newest crust is _#________ because it formed most recently. It is formed when ___________ and creates a __________. The oldest crust is located _________. It is being __________ and forming a ______. There are patterns of _________. These are called _______________.

How are magnetic stripes formed?

Grading Responses: Magnetic Stripes Is the evidence stated? (2 pt) –Evidence: There are patterns of magnetic polarity on the ocean floor Does the answer state what is proven by the evidence (a conclusion)? (2 pt) –Conclusion: The seafloor is spreading or tectonic plates are moving apart Does the answer explain how that evidence was used to make that conclusion? (2 pt) –Explanation: Because the ocean floor has different polarity, the pieces of the seafloor must have formed at different times. This shows that the seafloor must have been moving.

Grading Responses: Age Is the evidence stated? (2 pt) –Evidence: The seafloor is oldest near ocean trenches and newest near ocean ridges. Does the answer state what is proven by the evidence (a conclusion)? (2 pt) –Conclusion: The seafloor is spreading or tectonic plates are moving apart Does the answer explain how that evidence was used to make that conclusion? (2 pt) –Explanation: Because the ocean floor is newest near the ridges, that crust must have been formed most recently. This shows that new ocean floor has been created as the tectonic plates move apart (or as the seafloor spreads). Because the ocean floor is oldest near the trenches, the crust must be being pushed back into the mantle.

Grading Responses: Topography Is the evidence stated? (2 pt) –Evidence: Ocean ridges and trenches are present on the seafloor. Does the answer state what is proven by the evidence (a conclusion)? (2 pt) –Conclusion: Plate tectonic movement is creating these features Does the answer explain how that evidence was used to make that conclusion? (2 pt) –Explanation: Ridges are formed when… Trenches are formed when…

Focus Question: Max = 18pts For each piece of evidence, state what the evidence is and how it supports plate tectonics. (1 pt per evidence, 2 pt per explanation) Magnetic Patterns Age Topography (ridges, trenches) Fossil evidence Appearance of continents (puzzle pieces) Ancient Ice sheets

Plate Boundaries

Divergent Boundaries Rift Valleys Mid-Ocean Ridges (sea-floor spreading) Gently-sloped Volcanoes

Convergent Boundaries Oceanic- Continental & Oceanic-Oceanic –Subduction –Trenches –Volcanoes Continental- Continental –Mountains

Transform Boundaries Faults