Answer: Even though there are smalll amounts of these gases, they can have a major effect on Earth. For example, increased amounts of carbon dioxide are having a major effect on global warming. :)
The lithosphere is less dense
Angola's borders are fairly straight compared to borders of any other country. The coastline and the southern lines are straight while the eastern and northern borders have stair-like shape but are fairly straight too. The country looks like a gun in some way too!
The state of Vermont is known as green mountain state.
