What is the climate like in South America?-
The climate temperate, with wet and humid tropical zones.

Where are volcanic eruptions common?-
Asia.

What grain provides 41% of the world's calories?
Wheat.

What grain can grow in poor soil?
Sorghum.

Why did New Guinea remain isolated?
It is a lonely island, there are no major crops, and there are no animals that are able to be domesticated.