Moon and Sun Ch 15 study guide 1

3 things you know about day and night and what causes earth's seasons

1.Suns rays heat earth 2.Earth has seasons 3.fall:september :spring:march

3 things you learned about seasons

1.sun directly pointing, warmer sun farther apart, a little cooler 2.axis causes seasons as it moves around the sun 3.March 21, and September 22, about 12 hrs.

equinox

2 days of year when niether hemispheres are tilted toward or away from the sun

solstice

2 days of year when the noon sun is farthest north or south of the equator

Tilt of the Earth's axis

23.5 degrees

revolution of the earth

365 1/4 days

why does earth have seasons?

axis is tiled as it revolve around the sun

circle letter of each true sentence

c. when it is summer in the Northern Hemisphere, it is winter in the southern hemisphere d. in june there are fewer hours of daylight and less direct sunlight in the southern hemisphere

what is the law of universal gravitation

everything attracts every other thing

what causes day and night

rotation on our axis around the sun

what two factors determine the strength of the force of gravity between two objects?

the masses and the distance between objects