Lava lamps are commonly used to illustrate how convection cells in the mantle convey heat from the core to the exterior of the Earth. Explain how convection works, using a lava lamp as a proxy for the Earth
What will be an ideal response?
Answer: The bulb at the base of the lamp warms the wax in the lamp. The thermal energy from the absorbed heat causes the atoms of the wax to move farther apart, making the wax less dense and allowing it to rise. Once at the top, the wax begins to cool, losing thermal energy. The atoms of wax move closer together, making the wax denser and forcing it to sink. Once the wax gets near the bulb again, it begins to warm again and the process starts all over.
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Werner invited his students to see a particular rock type in France, whereby their viewpoint about the formation of all rocks changed. Why was this so?
A) They saw lava flows that clearly had not issued from the volcanoes and were composed of a rock called basalt; Werner believed that basalt was volcanic. B) They saw lava flows that clearly had issued from the volcanoes and were composed of a rock called basalt; Werner didn't believe that basalt was volcanic. C) They saw sandstone that contradicted their Neptunist beliefs. D) They saw metamorphic rocks that contradicted their Neptunist beliefs.
The melting point of a rock decreases with increasing pressure.
Answer the following statement true (T) or false (F)
Which of the following locations would most likely contain large, angular rocks?
A) Location 1, along the margins of a glacier
B) Location 2, along a steep mountain front
C) Location 3, in sand dunes
D) Locations 1 and 2
E) Locations 2 and 3
Answer the following statement(s) true (T) or false (F)
1. The chemicals needed by the Green Revolution have polluted India's environment. 2. India was forced to join the global economy after the collapse of the Soviet Union. 3. The number of states in India has remained the same since independence. 4. An expanding industry in Bangladesh is garment manufacture. 5. Sri Lanka has a diversified industrial base.