Well into the 20th century, many scientist's believed that the ocean floor was
a. flat
b. rocky
c. round
d. sandy

What is the role of communication within groups of people with different backgrounds?

According to the law of supply,suppliers want to sell their product at prices

Which statement is correct? the speed of the light ray is the same in air and medium a. the speed of the light ray is the same in air and medium b. medium a and medium b have different densities because light refracts at different angles. medium a and medium b have the same density because the light ray strikes both at the same angle.