Terms in this set (22)
the star at the center of our Solar System.
the third planet from the Sun.
Earth's only natural satellite; It takes the 27.3 days for the Earth to complete one rotation as well as one revolution around Earth.
to turn around a center point or an axis. Earth rotates fully on its axis every 24 hours and that is why we have day and night.
to move around another object. The Earth revolves around the Sun, which takes 365 days.
the path followed by a planet, moon, or other heavenly body as it travels around another object. The shape of Earth's orbit around the Sun is elliptical.
the force pushing down on us; force of attraction between two objects that have mass.
the layer of gases that surround the Earth
a real or imaginary straight line about which something turns. The imaginary axis of the Earth passes through the North and South Pole.
to slant or tip. The Earth is titled 23.5O
one half of a sphere or globe. The Earth is divided at the equator into the
Northern and Southern Hemispheres.
an imaginary line around the middle of the Earth, at an equal distance from the North Pole and the South Pole.
is a type of eclipse that occurs when the Moon passes between the Sun and Earth, and the Moon casts a shadow on Earth. This occurs during the New Moon phase.
is a type of eclipse that occurs when the Moon passes directly behind the Earth into its shadow. This can occur only when the Sun, Earth, and Moon are aligned during the Full Moon phase.
sunlight that travels directly or in a straight path; the equator gets more
direct sunlight than other areas on Earth.
sunlight that is not direct or straight; it strikes the Earth at an angle.
two days of the year when the sun is farthest from the equator in the northern or southern hemispheres: Summer Solstice and Winter Solstice.
two days of the year when the amount of day and night are of equal length all over the world: Autumnal (Fall) Equinox and Vernal (Spring) Equinox.
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth.
The exceptionally high and low tides that occur at the time of the new moon or the full moon when the sun, moon, and earth are approximately aligned.
A tide that occurs when the difference between high and low tide is the least; the lowest level of high tide. These tides occur during the first and third quarter phases of the moon.
Phases of the Moon:
New moon: moon phase during which the side facing Earth cannot be seen because it is not illuminated.
Crescent: moon phase during which less than half of the side facing the Earth is illuminated.
Gibbous: moon phase during which more than half of the side facing the Earth is illuminated.
Full moon: moon phase when the entire side facing Earth is illuminated.
Waxing: the illuminated surface of the Moon as seen from Earth is increasing in size.
Waning: the illuminated surface of the Moon as seen from the Earth is decreasing in size.