Which example of transportation most likely involves the widest variety of vehicles?
A. Blood is rushed from a blood bank to a local hospital.
B. Fresh vegetables are transported from a farm to a nearby city.
C. science textbook is transported from a printer in China to your school, and then to your home.
D. Gravel from a gravel pit is transported to construction sites across the state.

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.