[size=4]The zone of the atmosphere in which weather occurs is known as the:[/size]

[size=4]Examine the following chart that shows the size of soil particles.[/size]

[size=4][cmimg]0/10212553_2QLV552C.jpg[/cmimg][/size]

[size=4]Which of the soil particles shown above match of the following description?[/size]



[size=4][i]"It can be tightly packed, not allowing water to pass through easily. The particles are very heavy and thus roots of plants may break while penetrating. It is low in organic matter and thus cultivation is possible only through the addition of soil amendments. When rubbed between thumb and forefinger it feels sticky."[/i][/size]

[size=4]Ninety-nine percent of the volume of gases in the lower atmosphere, listed in descending order of volume, are:[/size]

[size=4]Which of the following environmental factors does NOT lower the pH of soil?[/size]

[size=4]Regional climates are mostly influenced by:[/size]