A volcano erupting can destroy the forest around it. That is an example of the geosphere acting on the biosphere.
Answer: Options A, B and D.
Explanation: shields are layers of old rocks that metamorphosed as a result of mountain-building events. Shields also have sedimentary layers that usually rest on the lava of the rock.
They are developed countries because the people there are healthy and educated.
One of the most common forms of weathering in areas that have frequent freeze/thaw cycles is ice wedging.
