30) Deforestation . A) decreases carbon dioxide in the atmosphere B) prevents erosion C) causes population explosions D) has the greatest impacts in tropical areas and arid regions E) is not widespread in North America

D. Has the greatest impacts in tropical areas and arid region

Explanation:

Deforestation involves the cutting down of trees. This process affects any type of climate and region because trees are important and acts as shields, protects from erosion etc

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e