A) stretch one side tighter B) only stretch one side C) stetch both sides the same
A) about 3.4 billion years B) about 18-20 billion years C) about 6000 years D) about 4.5 billion years
A) Chemical - the origin of higher elements from hydrogen. B) Cosmic - origin of time, space, and matter. C) Macro - changing from one kind to another. D) Micro - variations within kinds
A) a mass a few light years in diameter B) nothing C) a mass the trillionth the diameter of a protron
A) loose B) increase
A) closer to the earth B) neither of these C) away from the earth
A) staying the same B) slowing down C) speeding up
A) no B) yes C) I don't know
A) less saltier B) saltier C) neither |