How can satellites people study the earth

They can take highly accurate pictures and give us information that we might not be able to get while on earth

They use them to make maps, if you take pictures from satellites you will be able to study many different places, i think if its not what your looking for im sorry.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.