Sediments which are poorly sorted and made of a variety of minerals could have been deposited by:
a) a volcanic eruption.
b) turbidity currents.
c) the wind.
d) a river delta.
e) a glacier.

B) Turbidity currents

Explanation: Turbidity currents are large scale water movements which picks and carries different particles in the form of sand,rocks,minerals and other materials which are poorly sorted as it flows to the point of depositon.Turbidity currents contain particles of different sizes, types and shapes as it flow,as it picks larger particles it's speed continue to Turbidity currents are caused my geological movements, earthquakes and cracked slopes. Other options don't carry as much variety of materials as Turbidity currents.

answer; native americans who sometimes actively impeded railroad construction; physical obstacles like rivers and canyons, and