k (V) the correct statements and cross (x) the wrong ones. Air is a compound formed by different substances. We use different kinds of mixture in our daily life. The mixture of salt and water is a heterogenous mixture. A mixture of carbon dioxide and water forms soda water. Muddy water is an example of a heterogenous mixture,​

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.

explanation:

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.

answer: 21

step-by-step explanation:

divide 630 by 30. 30 goes into 630 21 times