Examine the photo of Hoover Dam.
What major modification of the environment can be seen in
this image?
decreased flooding downstream
loss of animal habitat downstream
production of electricity by the dam
land flooded to create a lake behind the dam

According to the earth science reference tables, during which geologic time period were the continents of north america,south america, and africa closest together?

Which statement explains what upwelling causes? a. upwelling causes tides to rise and fall. b. upwelling causes changes in the direction of currents. c. upwelling causes nutrients, minerals, and tiny organisms to rise. d. upwelling causes currents in the pacific ocean to change direction. i think the answer is c.

What is an example of a line segment