Which of the following factors contribute to the great famine in ireland in the mid-nineteenth century?
a)plant disease
b)climate change
c)emigration
d)civil war

Describe two recent or ongoing space missions.

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in cenozoic deposits, but they are generally dissolved or recrystallized in older deposits. true or false