C2 Revision Helpsheet Lesson Objectives Tasks Describe the Draw and label a diagram State what the lithosphere is How do we know what the structure of the showing the 4 main layers of structure of the earth is? earth the earth Explain how the Where are volcanoes usually Explain in terms of density why the magma rises through the crust. molten rock found? (Use the phrase reaches the earth’s tectonic plates in your surface answer) Describe the theory Explain what a convection are more dense oceanic Explain what subduction is. – of plate tectonics current is. or continental plates? Describe how the Describe the evidence that Give two reasons why Give three new pieces of theory of plate Wegener had for his Wegener was not believed. evidence that have led to plate tectonics continental drift theory. tectonics theory being believed. developed Explain how What is the difference Describe the appearance of Describe how the size of crystals igneous rocks form between and lava? igneous rock (e.g. crystals or in igneous rock depends on the grains, does it contain layers?) rate of cooling. Describe the work State two reasons why Which is likely to give a more Describe two reasons why of geologists in people might choose to live violent and deadly explosion geologists study volcanoes. – studying volcanoes near a volcano. a volcano with runny lava or one with thick lava?
C2 Revision Helpsheet Lesson Objectives Tasks Describe the structure of the earth Draw and label a diagram showing the 4 main layers of the earth State what the lithosphere is How do we know what the structure of the earth is? Explain how the molten rock reaches the earth’s surface Where are volcanoes usually found? (Use the phrase tectonic plates in your answer) Explain in terms of density why the magma rises through the crust. Describe the theory of plate tectonics Explain what a convection current is. are more dense – oceanic or continental plates? Explain what subduction is. Describe how the theory of plate tectonics developed Describe the evidence that Wegener had for his continental drift theory. Give two reasons why Wegener was not believed. Give three new pieces of evidence that have led to plate tectonics theory being believed. Explain how igneous rocks form What is the difference between and lava? Describe the appearance of igneous rock (e.g. crystals or grains, does it contain layers?) Describe how the size of crystals in igneous rock depends on the rate of cooling. Describe the work of geologists in studying volcanoes State two reasons why people might choose to live near a volcano. Which is likely to give a more violent and deadly explosion – a volcano with runny lava or one with thick lava? Describe two reasons why geologists study volcanoes.
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