A student make a model of a river in a sandbox. A pile of sand represents soil and bits of rock in the riverbed. Water pouring from a hose represents river water as it flows downhill. Which two characters are limitations of the students model?
A. The model is missing plants, fish , and other details found in a real river.
B. The model soil is nothing like the soil found in a real riverbed
C. The model is much smaller than a real river .
D. The model river water flows downhill instead of uphill like real river water does.

Which compounds have the empirical formula ch2o? a.c2h4o2 b.c3h6o3 c.ch2o2 d.c5h10o5 e.c6h12o6

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?