<span>parts of Europe are very polluted because they have a very high population density</span>
The answer would be depressions. Hachure lines, or lines with teeth, describe depressions. These lines are concentric lines which indicate a closed depression. These lines show orientation of slope and they provide an idea to the steepness of that area.
Hot magma pushes itself to the surface at both divergent plate boundaries and convergent plate boundaries. This magma comes in contact with rocks as it rises to the surface. The magma is hot, heating the rocks around it. As the rocks heat, they change and become metamorphic rocks.
