9. Circle the letter of each sentence that is true about water's surface tension. a. It helps some insects "skate" across the surface of the water.
b. It refers to the tightness across the surface of the water.
c. It is caused by polar molecules repelling each other.
d. It causes raindrops to form round beads.

Explanation:

that boy sus please vote red oh dang not the right app my bad

the answer is b: 1.4 km/hr

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.