What are some ways we can organize our world and the study of geography?

What is the amount of organic matter in all living organisms in a habitat called?

Afarmer who is grown corn for the past five years notices in the sixth year that the his harvest is significantly smaller, despite an increase in labor on the farm. the following year, the harvest continue to decline. which of the following explanations most plausibly accounts for the reduction in corn yield? a) soil degradation b) desalinization c) better irrigationd) terracing

This desert is found in the northern part of africa and covers 3.5 million square miles.