A Sea Stack is an isolated remnant of bedrock standing above a wave-cut platform. Here is what Sea Stack formed. The cracks then gradually get larger and turn into a small cave. When the cave wears through the headland, arch forms.
Magma that does not reach the surface is called intrusive rock
The Sahara desert is important for a multiple of reasons. One is that although it is a desert, there are many fertile areas of land making it great for farming and supporting life. It also acts as a natural barrier in between north and south Africa, which was able to impact trade with the South, slowing down innovation on both sides.
Sweeping floors, washing dishes, laundry, and cooking can all be done without running water or electricity. Hope I helped! <span />