A paragraph on acid rain...please no copy and pasted.

Acid rain is quite unusual but very highly corrosive to nature and even kills a lot of vegetation. It is caused when gaseous compounds of ammonium, carbon, nitrogen, and sulphur are released into the atmosphere. Acid rain that seeps into the ground can dissolve nutrients, such as magnesium and calcium, that trees need to be healthy. The ecological effects of acid rain are most clearly seen in aquatic environments, such as streams, lakes, and marshes where it can be harmful to fish and other wildlife.

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1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.