The outer structure of the earth is made up of the following except?

Which of the following is an importance of the atmosphere to living organisms?

The correct arrangement of the layers of the earth crust from the surface to the interior is

If the scale of a map is 2cm to 1km, what is the ground distance if the distance between two towns on the map is 20cm

If the scale of two maps are (a;1:100,000 and b;1:400,000) what is the ground distance if the distance between two towns on the maps is 10cm