how are pure carbon, oxygen, hydrogen different from thecompoundethanol which contains all three of those elements

Carbon, oxygen, & hydrogen may all be elements found in ethanol, but when separated, they have completely different chemical compounds. They are pure elements where as ethanol is a mixture.

✿   this landform has a high elevation and a high relief

✿   this landform is a mountain

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.