siliceous
Deep seafloor deposition in the form of ooze is the largest long-term sink of the oceanic silica cycle (6.3 ± 3.6 Tmol Si year−1). As noted above, this ooze is diagenetically transformed into lithospheric marine chert.
calcareous
Calcareous ooze is a calcium carbonate mud formed from the hard parts (tests) of the bodies of free-floating organisms. Once this mud has been deposited, it can be converted into stone by processes of compaction, cementation, and recrystallization. ... Foraminifera are also single-celled organisms.
It was the Battle of Trenton, in New Jersey. Hope this helps!
C - Mexico granted its norhter terrorities to the US. The US terrority now reached all the way to the Pacific Ocean in the west.
The Mexican American war resulted in the Treaty of Guadalupe and gave the US sovereignty over Texas and western terrorities.
Cultural diffusion means that some cultures and values would spread from one place to another. So it's not enough for them to be preserved in the original place, (this makes us exclude options B and C) but they need to be spread to other places, such as to other parts of the US - the correct answer is a)
