Question 1: At present, glacial ice covers about.% of the Earth's surface but has covered as
much as about.% during the last Ice Age.
Question 2: Deep ocean circulation is driven primarly by.
Answer: Difference in water density.
About 99% of the water in the atmosphere occurs in the troposphere. Explain why.
Correct Almost all the water in the atmosphere occurs in the troposphere (the lowest layer of
Answer: the atmosphere) because Earth's surface (mostly the ocean) is the princi
Distribution of the World Ocean.
Ocean basins and continents are unevenly distributed over surface.
Ocean is 71% of planet, 29% is land.
Ocean is less dominent in Northern Hemisphere than Southern Hemisphere.
*Northern Hemisphere is 39.3% land
Now that you have been introduced to the Earth System,
biogeochemical cycles, and the Theory of Plate Tectonics, where do
you think the salt in the salty ocean comes from? And can you explain
how the oceans salinity has remained vi
We recognize that the Earth system consists of several subsystems
(hydro- and cryosphere, biosphere, atmosphere and geosphere) and
that they are all connected. We also recognize that water is a unique
component of the Earth system.
Anomalous deposits of dropstones from freshwater icebergs were given the
name Heinrich layers after their discovery on the seafloor of the North Atlantic
in 1988 (Essay 1 in Chapter 4).
The causes for the observed 6 events leading
Some models suggest that the arctic sea ice could disappear within the next
decade. If this should happen discuss some of the changes that might occur and
how our lives could be affected.
The most obvious result is that the