Question

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Explanation:

Question 2

The Nazca plate and the South American plate interact in a convergent boundary (colliding) to form the Andes Mountains. Convergent boundaries involve plates moving toward each other, and when an oceanic plate (Nazca) and continental plate (South American) collide, the oceanic plate subducts, but the collision also pushes up the continental plate to form mountains. So the correct term is "colliding".

The Pacific plate and North American plate have a transform boundary where they slide past each other. The correct term for this movement is "sliding" (more accurately "sliding" or "transforming", but "sliding" fits the context here as the plate moves past another).

In the middle of the Atlantic Ocean, there is a mid - ocean ridge which is formed because the plates (North American and Eurasian, South American and African) are moving apart. This process is called seafloor spreading, and the area is a "spreading" zone (or more precisely, the ocean floor is "spreading" as new crust is formed). So the word to fill in is "spreading".

Answer:

colliding

Question 3