Question

1. read this sentence from the text. \as you can guess, the oceanic crust is composed of the pieces that cover the ocean floor, and the continental crust forms our continents.\ as used in the text, what does the word \composed\ mean? a) studied b) divided c) made up d) shifted 7. choose the answer that best completes the sentence. the continents are slowly but constantly changing in location. _________, the continents used to form a single landmass called pangaea but gradually drifted apart. a) for example b) currently c) including d) above all 8. what are convection currents? 9. how do convection currents help form underwater mountains? 10. explain two ways in which changes on the earth’s surface are connected to changes below earth’s surface. support your answer with evidence from the text.

Explanation:

1. In the context, "composed" means made up of parts. The oceanic crust is made up of pieces covering the ocean - floor.
2. The second sentence gives an example of the first sentence's claim about continents changing location. "For example" is used to introduce an example.
3. Convection currents are the movement of fluid (such as magma in the Earth's mantle) due to differences in temperature and density, with warmer, less - dense material rising and cooler, denser material sinking.
4. Convection currents in the Earth's mantle can cause the movement of tectonic plates. When plates move apart at mid - ocean ridges, magma rises up through the gap. As the magma cools and solidifies, it builds up and forms underwater mountains (mid - ocean ridges).
5. One way is through tectonic plate movement caused by convection currents in the mantle. For example, the movement of plates can lead to the formation of mountains on the surface. Another way is volcanic eruptions. Magma from below the Earth's surface can erupt through weak spots in the crust, creating new landforms like volcanic islands on the surface.

Answer:

1. C. made up
2. A. For example
3. Convection currents are the movement of fluid due to differences in temperature and density, with warmer, less - dense material rising and cooler, denser material sinking.
4. Convection currents in the mantle cause tectonic plates to move apart at mid - ocean ridges. Magma rises through the gap, cools, and solidifies to form underwater mountains.
5. One way is through tectonic plate movement caused by mantle convection currents leading to mountain formation. Another is through volcanic eruptions where magma from below the surface creates new landforms.