As farmers use the land, it often changes from arable land to desert. this process is known as
a. farmification.
b. desertification.
c. deforestation.
d. land accommodation.

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What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4