Those streaks of color appear because we have so many trees. ... Why do trees need water? ... Additional water transpires through the pores in their leaves. ... That suction must be strong enough to suck water out of the soil. The amount of force needed depends on the amount of water in the soil (a drier soil holds water more tightly), as well as the height to which the water must be lifted (a greater height requires more force, while a lesser height requires less force). ...

• Word Count: 2774
• Approx Pages: 11
• Grade Level: High School