Farmers use an index called ____ as a guide to planting and for determining the approximate dates when a crop will be ready for harvesting
a. heating degree days
b. harvesting degree days
c. growing degree days
d. cooling degree days
e. ripening degree days
ANSWER: c
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A cannon recoils from firing a cannonball. The speed of the cannon's recoil is small because the
A) force against the cannon is smaller than against the ball. B) momentum is mainly concentrated in the ball. C) cannon has more mass than the ball. D) momentum of the cannon is smaller.
Biologic weathering is essential for soil formation.
Answer the following statement true (T) or false (F)
The world's economies are not affected by climate change
Indicate whether the statement is true or false
What triggered the debris avalanche that caused the destruction of Yungay, Peru?
A) rainfall B) an earthquake C) volcanic activity D) snowmelt