An open-pit iron mine has been abandoned for several years. Before they left, the miners filled in the pits with soil that included tailings and other iron containing waste products from the mine's productive years. Which of the following hazards do the pits most likely pose to the surrounding environment? Acid mine drainage
Cyanide leaching
Increased carbon emissions
I only
II only
III only
I and III only

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.

a supercell is a thunderstorm with a deep, persistently rotating updraft. supercells are the least common form of thunderstorm yet they are potentially the most violent. large hail of greater than baseball size, strong damaging winds, and tornadoes can accompany these storms.

explanation:

b. antarctica

explanation:

about 90% of the world's ice can be found on antarctica.