Across
- 4. relatively flat, dark colored regions on the moon's surface
- 7. occurs during new moon, when the moon passes directly between the Sun and Earth, casting a shadow on part of Earth
- 8. changing appearance of the moon Moon as viewed from Earth
- 9. 15 degree wide area on Earth's surface in which the time is the same
- 12. occurs twice yearly (June and December), when the sun reaches its greatest distance north or south of the equator
- 13. rise and fall in earth's sea level, caused by a giant wave formed by the gravitational pull of the Sun and Moon
- 14. elongated closed curve with two foci, shape of earth's orbit around the sun
Down
- 1. movement of Earth in its orbit around the Sun; measures time in years
- 2. attractive force between two objects that depends on the masses of the objects and the distance between them
- 3. occurs during the full moon, when the month enter earth's umbra and earth casts a curved shadow on the moon's surface
- 5. spinning of Earth on its axis, measures time in days
- 6. layer of debris on the Moon's surface formed by the accumulation of meteoric material
- 7. three-dimensional, round object whose surface is the same distance from the center in all directions
- 10. occurs twice yearly (March and September) when the sun is directly above earth's equator, and the number of daylight hours equals the number of nighttime hours worldwide
- 11. yearly path of Earth around the Sun