From an archived question I looked up for you, I believe it should be water-table aquifers. By the way, if you look in the link above, replace the 4449929 with 482974 to see the answer to it!
During photosynthesis, trees and other plants absorb carbon dioxide and give off oxygen. Trees keep in cheek the air and water pollution. Why planting trees is important is evident as they are the natural habitat of the animals and birds, as well as many endangered species.
Since oceanic plates are the same density, neither will subduct causing them to rise and potentially create volcanoes
Fiefs are upper class nobility is the answer<span />
ANSWER: The climate in that area is different today than when tropical plants and animals lived there.