Words to know Write the letter of the definition next to the matching word as you work through
the lesson. You may use the glossary to help you.
fossil fuel
A. the movement of nitrogen through the living
and nonliving parts of the environment
nitrogen cycle
B. the movement of carbon through the living
and nonliving parts of the environment
carbon cycle
C. the change of state from a gas to a liquid
water cycle
D. a fuel formed from the remains of organisms
condensation
E the movement of water through the living
and nonliving parts of the environment

Your starship, the aimless wanderer, lands on the mysterious planet mongo. as chief scientist-engineer, you make the following measurements: a 2.50-kg stone thrown upward from the ground at 14.0 m/s returns to the ground in 5.70 s ; the circumference of mongo at the equator is 2.20×10^5 km ; and there is no appreciable atmosphere on mongo. (a) the starship commander, captain confusion, asks for the following information: what is the mass of mongo? (b) if the aimless wanderer goes into a circular orbit 2.20×10^4 km above the surface of mongo, how many hours will it take the ship to complete one orbit? (c) an unmanned spacecraft is in a circular orbit around the moon, observing the lunar surface from an altitude of 44.0 km . to the dismay of scientists on earth, an electrical fault causes an on-board thruster to fire, decreasing the speed of the spacecraft by 23.0 m/s . if nothing is done to correct its orbit, with what speed (in km/h) will the spacecraft crash into the lunar surface?