1. The oldest of Hawaii's volcanic islands are those that
A. are the farthest distance from the hotspot.
B. are a short distance past the hotspot.
C. are on top of the hotspot.
D. have not yet reached the hotspot.
2. Which is caused by the difference in density of oceanic and continental plates?
A. hotspots
B. pyroclastic flows
C. subduction
D. rift valleys
3. Which processes are important in the formation of volcanic arcs at the edge of continental plates? Select the two correct answers.
A. plate divergence
B. uplift
C. subduction
D. passing over a hotspot
Answer:
1) uplift & subduction
2)are the farthest distance from the hotspot.
3)subduction
Explanation:
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To answer the first question, we need to understand the basic geography and formation of Hawaii's volcanic islands. The Hawaiian Islands are a chain of volcanic islands formed by a hotspot in the Earth's mantle beneath the Pacific Plate. As the Pacific Plate moves gradually northwest over the hotspot, new volcanoes form and older ones become inactive, creating a chain of islands.
The oldest of Hawaii's volcanic islands can be determined by their distance from the hotspot. So, the answer to question 1 would be:
A. The oldest of Hawaii's volcanic islands are those that are the farthest distance from the hotspot.
Moving on to question 2, we need to know what causes the difference in density of oceanic and continental plates. When an oceanic plate collides with a continental plate, the denser oceanic plate usually subducts beneath the less dense continental plate. This process is called subduction.
So, the answer to question 2 is:
C. Subduction is caused by the difference in density of oceanic and continental plates.
Finally, for question 3, we need to identify the processes involved in the formation of volcanic arcs at the edge of continental plates.
Plate divergence refers to the splitting and moving apart of tectonic plates, which is not directly relevant to the formation of volcanic arcs. Uplift, on the other hand, usually occurs in mountainous areas and is not directly related to volcanic arc formation either.
However, subduction is a key process in the formation of volcanic arcs. When an oceanic plate subducts beneath a continental plate, it can lead to the melting of the subducted plate, causing volcanic activity and the formation of a volcanic arc.
Passing over a hotspot does not contribute to the formation of volcanic arcs at the edge of continental plates. Hotspots are generally associated with island chains like Hawaii rather than volcanic arcs.
Thus, the correct answers to question 3 are:
B. Uplift
C. Subduction
1.a
2.c
3.b and c