Which statement about the layers of Earth is true? A.
The mantle consists of molten iron.
B.
The inner core of Earth is made up of molten nickel.
C.
The lithosphere is the outermost layer of Earth.
D.
The mesosphere is sometimes referred to as the crust.

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