What is the ph scale? a. it is a measure of the acidity in a solution. c. it is a measure of the amount of pollution in the air. b. it is a measure of the severity of acid rain. d. it is a measure of the quantity of sulfuric and nitric particles in the air.

All of these sentences include commonly confused homophones. which sentence is correct? you put too much sugar on your breakfast serial. my father grows vegetables and flours in his garden. will someone me untie the knot in my shoelace? when did the captain set sale on his trip to north america?

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Feedback is given with little or no reservation 1.supportive 2.high-monitoring 3.positive 4.low-monitoring ?