Little is known about much of earth’s early history because
a. precambrian rocks have been deeply buried
b. precambrian rocks have been changed by heat and pressure
c. precambrian soft-bodied life-forms weren’t often preserved as fossils
d. all of the above

Matt is driving down 7th street. he drives 150 meters in 18 sec. assuming he doesn’t slow down or speed up, what is his speed?

Why is metal often used for cooking pan?

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.