Up to how much of the glacier ice has melted from Mount Everest's north side between 1921 and 2008? (starting at 5:00) a. 10%
b. 40%
c. 75%
d. 100%

Which of the following is true about fossils? a. the relative age of fossils cannot be determined from their position in sedimentary layers. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. fossils found in upper layers of sedimentary rock are older than fossils found in lower layers of sedimentary rock. d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

:calculate the sum of the interior angles of a 13-sided polygon.

Where does the availability of water pose the greatest problem