Which gas is a source of natural groundwater pollution ? a. hydrogen b. radon c. carbon d. oxygen

How has the geography of india made it difficult for its people to expand before modern technology?

In an effort to japan recover from the devastating effects of the 1929 depression, japanese military leaders in the 1930s formed an alliance with nazi germany negotiated more trade treaties with the soviet union closed its doors to western trade adopted a policy of imperialist expansion

Which force of change to earth is caused by the movement of tectonic plates? a.erosion b.pollution c.earthquake d.wind i need and it’s 35 points so can someone plz me