In divergent boundaries, plates move away from one another, often causing volcanic activity. The cooled magma is able to form islands such as the ones on the Aleutian archipelago.
*I don't think any of these are actual types of mountains. <em>Arc contient </em>and <em>Andean</em> aren't even real things.
As for your second question:
There are two main types of rocks in the Earth's crust.
Granite is less dense and rises higher, usually above land in continental crust.
Basalt is denser and so it will sink lower and form oceanic crust.
However, there is a layer of sediment on top of that crust. (sand, gravel, etc.)
Valleys, waterfalls, meanders, oxbow lakes, and floodplains.
I think it is number 3 or c because earths layer is just the right tempature for us to live on, and the mantle is very hot liquid that is under the crust or the 1st layer of earth and it gets hotter the deeper you go like the inner core is molten metal and is very very hot. hope this helps
