Why don't trees spontaneously catch on fire and burn all the time?

No. It all happens to be the environment. If the same heated environment stays the same and there is a fire, this is most likley because of the environment and the circumstances.  also people are constantly around to cause one using matches, and stuff of the sort.

Explanation:

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;

the tides are influenced by both the moon and the sun, it's easy to see that when the sun lines up with the moon and the earth, as during a new moon or full moon, the tidal effect is increased. these are known as spring tides, named not for the season, but for the fact that the water "springs" higher than normal. on the other hand, if the sun and the moon are 90 degrees apart in relation to an observer on earth as during the first quarter moon or third quarter moon, then high tides are not as high as they normally would be. this is because despite its greater distance, the sun's mass allows it to exert enough gravitational force on the oceans that it can negate some of the effects of the moon's pull. this phenomenon of lower high tides is called a neap tide. if you need more information on this topic visit moonconnection.com.