Science

The exact moment when half of Earth is tilted the farthest away from the sun.

• Winter Solstice

• Summer Solstice

• Fall equinox

• Spring equinox

The times of the year when the amount of daylight and nighttime hours are just about of equal length.

• Winter Solstice

• Summer Solstice

• Fall equinox

• Spring equinox

The exact moment the earth's tilt toward the sun is at a maximum.

• Winter

• Summer

• Fall equinox

• Spring equinox

The time at which the sun crosses the plane of the equator towards the relevant hemisphere, making day and night of equal length.

• Winter Solstice

• Summer solstice

• Fall equinox

• Spring equinox

The assemblage of objects, distances, and directions that you use to

establishing the location of something is called a frame of reference.

• Frame of reference

• Subsystem

• axis

• equinox

A self-contained system within a larger system.

• Subsystem

• Frame of reference

• axis

• equinox

 The thin layer made up of a mixture of gasses and particles suspended in the air that surround the Earth.

• Atmosphere

• Biosphere

• Cryosphere

• Geosphere

• Hydrosphere

A sphere that includes all of Earth’s organisms, including humans, and matter that has not yet decomposed.

• Atmosphere

• Biosphere

• Cryosphere

• Geosphere

• Hydrosphere

A subset of the hydrosphere that consists of frozen water.

• Atmosphere

• Biosphere

• Cryosphere

• Geosphere

• Hydrosphere

A sphere that includes the solid Earth; the core, mantle, crust and soil layers.

• Atmosphere

• Biosphere

• Cryosphere

• Geosphere

• Hydrosphere