Which occurs at a convergent boundary where one plate moves under another plate?
a.
hotspot
b.
deep sea trench
c.
mid-ocean ridge
d.
rift valley

What is the difference between external & internal migration

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

Monk’s mound in cahokia is an enormous earthwork very near to the mississippi river. what do archaeologists believe it was used for?