1. What is natural increase in a population? A. the movement of people from place to place
B. the difference between an area's birthrate and its death rate
C. the number of deaths per year for every 1,000 people
D. the number of years it takes a population to double in size

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

One mole of zinc has a mass of 65.4 grams. approximately how many atoms of zinc are present in one mole of zinc? 32 × 1023 atoms 6 × 1023 atoms 66 atoms 65 atoms

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust