Four processes are described below: process a: waves in a river lift rocks which crash down to the river bed and break process b: water in the cracks of rocks freezes and breaks open the rocks process c: an organic acid produced by rotting vegetation makes holes in rocks process d: roots of plants push against rocks and make cracks in them which process represents chemical weathering? process a process b process c process d

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

d

explanation: