Question

1. in figure 1 - 1, what layer of earth’s geosphere is labeled a? a. inner core b. outer core c. upper mantle d. crust
2. in figure 1 - 1, what layer of earth’s geosphere is labeled c? a. crust b. upper mantle c. lower mantle d. outer core
3. the crust and uppermost mantle make up the rigid outer layer of earth called the ___. a. geosphere b. asthenosphere c. lithosphere d. lower mantle
4. the theory of plate tectonics helps scientists explain ___. a. how ocean currents move over earth’s surface b. why hurricanes occur c. how earthquakes and volcanic eruptions occur d. why earth’s core is less dense than the mantle
5. what is the driving force for the movement of the lithospheric plates? a. heat from the sun b. unequal distribution of heat within earth c. heat in the atmosphere d. unequal distribution of heat in the oceans
6. one kind of evidence that supports wegener’s hypothesis is that ___. a. the same magnetic directions exist on different continents b. major rivers on different continents match c. land bridges still exist that connect major continents d. fossils of the same organism have been found on different continents
7. according to the theory of plate tectonics, ___. a. the asthenosphere is divided into plates b. the lithosphere is divided into plates c. the asthenosphere moves over the lithosphere d. the asthenosphere is strong and rigid

Explanation:

1. The innermost part of the Earth is the inner - core. In a cross - section of the Earth, the innermost labeled part would be the inner core.
2. Moving from the outermost crust, through the upper mantle, the next major layer is the lower mantle.
3. The crust and the uppermost mantle together form the lithosphere, which is the rigid outer layer of the Earth.
4. Plate tectonics theory helps explain the movement of Earth's lithospheric plates and associated phenomena like earthquakes and volcanic eruptions.
5. The driving force for the movement of lithospheric plates is the unequal distribution of heat within Earth, which causes convection currents in the mantle.
6. Fossils of the same organism found on different continents are evidence supporting Wegener's hypothesis of continental drift.
7. According to plate tectonics theory, the lithosphere is divided into plates that move over the asthenosphere.

Answer:

1. a. inner core
2. c. lower mantle
3. c. lithosphere
4. c. how earthquakes and volcanic eruptions occur
5. b. unequal distribution of heat within Earth
6. d. fossils of the same organism have been found on different continents
7. b. the lithosphere is divided into plates