How are seafloor sediments useful in reconstructing past ocean conditions? Choose all that apply. a. Biogenic oozes are composed of organisms that used to live on the seafloor, so their distribution provides information about deep-ocean conditions. b. Siliceous oozes on the seafloor indicate a warm surface ocean directly above the deposits. c. Sediments that accumulate on the seafloor provide information about ocean conditions at the time that the sediment was deposited. d. Calcareous oozes on the seafloor indicate a cool surface ocean directly above the deposits. e. Changes in the composition of the seafloor sediment reflect changes in the depositional environment.

Seafloor sediments are useful in reconstructing past ocean conditions by:

c. Sediments that accumulate on the seafloor provide information about ocean conditions at the time that the sediment was deposited.

e. Changes in the composition of the seafloor sediment reflect changes in the depositional environment.

Explanation:

Seafloor sediments are the remainings found in the bottom of the ocean. These can come from organic or inorganic sources. The organic ones are formed from the rest of microorganisms, animals, or plants. While the inorganic can come from the earth, volcanic events, or minerals. Both inorganic and inorganic come from the ocean or the land outside the oceans. Therefore they can be used to explain the ocean conditions as well as the changes in the seafloor.  

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.