The lesson learned by Arliss and Todd Nielsen on their Iowa farm is that ________
A) erosion and soil nutrient losses are reduced with no-till agriculture
B) global climate change is producing desertification in Iowa
C) removing all weeds is essential for highest crop yields
D) crop yields are much lower using polyculture
E) plowing in the winter increases soil fertility and crop yield
A
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What types of structures are shown in this photograph?
A) Joints
B) Normal faults
C) Reverse faults
D) Anticlines
E) Synclines
Animal matter and vegetable matter can sometimes be minerals
Indicate whether the statement is true or false
Barter occurs nowhere on earth now
Indicate whether the statement is true or false
Precipitation in desert areas is almost always ____
a. caused by cyclonic activity b. associated with the high sun season c. infrequent, unreliable, and intense d. caused by orographic lifting of cT air masses