The path that Lewis and Clark traveled west on is marked in red. Which geographical features helped Lewis and Clark travel west across the United States?
OA. mountains
OB. rivers
OC.
lakes
OD. plains

What do most climatologists see as a major cause of rising global temperatures? a. earth's closer proximity to the sun due to its gravitational pull b. greenhouse gases produced by burning fossil fuels c. rising ocean levels caused by melting polar ice sheets d. water pollution cause by industrial waste