| A | B |
|---|
| Rotation of Earth | occurs every 24 hours |
| Gravity on the Moon | 1/6 that of Earth |
| Equinox | Noon sun directly over the equator |
| Seasons | Caused because the earth’s axis is tilted |
| Rocket | Moves forward when hot gasses are expelled from the rear |
| Maria | Areas on the moon flooded by molten material |
| Crater | Caused by meteroid impacts |
| Solar Eclipse | Moon blocks sunlight from reaching the earth |
| Revolution | Movement of the earth around the sun |
| Retrograde rotation | Rotation east to west |
| Asteroid belt | Between the orbits of Mars and Jupiter |
| Comet | Chunk of ice and dust with a head and a tail |
| Heliocentric | Sun-centered model of the solar system |
| Inertia | Tendency to remain in motion |
| Core | Nuclear fusion in the sun occurs here |
| Solar Wind | stream of electrically charged particles produced by the sun’s corona |
| Earth | covered 70% by water |
| Outer Planets | made of gasses |
| Pluto | rocky outer planet |
| Meteroids | come from comets or asteroids |
| Ptolemy | supported geocentric theory |
| Copernicus | proved heliocentric theory |
| Galileo | developed heliocentric theory |
| Kepler and Brahe | determined shape of orbits |
| Newton | stated inertia and gravity keep planets in orbit |
| Abiotic | Nonliving parts of the environment including rocks, water, air, etc. |
| Biotic | Living parts of the environment |
| Community | Third level of organization in an ecosystem including all populations in the ecosystem |
| Consumers | Needs to eat other organisms |
| Ecosystem | Community of living things with their nonliving environment |
| Producer | Uses sun's energy to gain energy and make food |
| Omnivore | Eats plants and animals |
| Food Chain | Diagram that shows the flow of energy from producers to consumers |
| Limiting Factor | Resource that keeps a population from growing |
| Competition | Struggle between organisms for resources |
| Predator | Catches and eats another animal |
| Mututalism | Symbiosis in which organisms help each other |
| Biosphere | Depths of the ocean to the heights of the air |
| Population | Group of organisms of the same species |
| Commensalism | Symbiosis in which one organism is helped and one is not affected |
| Herbivore | Eats only plants |
| Parasite | Organism that harms another |
| Host | Organism that is harmed by another |
| Prey | Organism that is eaten by another |
| Scsavenger | Organism that eats dead animals |
| Decomposer | Organism that breaks sown dead organisms and wastes |
