Why isn't the Grand Canyon of the Colorado simply a product of the erosion by the river?
What will be an ideal response?
Answer: As the river has cut downward a mile, the canyon sides have been kept steep by a series of caprock layers. these have worn back at a much greater rate than the river has cut downward so the width of the canyon is over 15 km.
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Tuvalu, Kiribati, and the Marshall Islands are already experiencing disastrous flooding related to global climate change. What has been the response of the people on these islands?
A) They have built polders patterned after those found in the Netherlands. B) The islands have banded together into a strong political union lobbying for a global solution to climate change. C) All three have instituted a policy of transmigration, encouraging citizens to move to the center of their island countries. D) Scientists on these islands have worked together to build a highly advanced sea wall. E) They have done nothing.
What surface feature is present on Earth above the rising limb of a mantle convection cell?
a. trench b. spreading ridge c. hot spot d. continental mountain chain e. volcanic island arc
Compared to the temperature today, the past Earth's atmosphere was:
a. significantly warmer b. slightly colder c. almost the same d. significantly colder
Cone-shaped deposits of sediment often found at mouth of stream canyons in arid and semiarid climates are called
A) alluvial fans. B) fjords. C) deltas. D) alluvial terraces. E) talus cones.