Science Study Guide Chapter 20:The Sun-Earth-Moon System
How long would it take Earth to make a rotation?
24 hours (1 day)
How long does it take to make one revolution around the Sun?
365 days (1 year)
What is the shape of Earth orbit around the Sun?
A near circle
Rotation
A spinning motion
December Solstice
December 21-22( The north end of Earths axis is leaning far from the Sun)The south end is closed/The northern hemisphere has its fewest number of daylight hours/ Winter begins/The southern hemisphere has its the greatest number of daylight hours/ summer begins.
What can happen if the gravity between the Sun and Earth stopped?
Earth could fly into space in a straight line
How does the moon move around the Earth?
Earth's gravitational pull causes the moon to orbit Earth. It takes the Moon 27.3 days to orbit Earth. As it does it goes through different phases.
What causes the Sun's Apparent Motion?
Earth's rotation
What is Fall and Winter like in the Northern Hemisphere?
Gets less energy from the Sun than the southern hemisphere. Temperatures are cooler/ warmer in the Southern hemisphere. Its Spring or Summer in the Southern Hemisphere.
What is Spring and Summer like in the Northern Hemisphere?
Gets more energy from the Sun than the southern hemisphere. Temperatures are higher and days are longer. Its Fall or Winter in the Southern Hemisphere
June Solstice
June 21-22( The north end of Earth axis is leaning closest to the Sun)- The South end is farthest away- Northern Hemisphere has more daylight hours/ Sun starts/ The Southern Hemisphere has fewer daylight hours/ Winter starts
March Equinox
March 20-21 (Both ends of Earths rotation axis are equal distances from the Sun) ~ 12 hours of day and night/~ Spring starts~ in the Northern Hemisphere/ ~Fall start's~ in the Southern Hemisphere.
What is the Northern end Rotation like when its axis points away from the Sun?
Northern Hemisphere gets less sun light/Southern Hemisphere gets more Sunlight
What is the Northern end Rotation like when its axis is pointed towards the Sun?
Northern Hemisphere gets more sun light/ Southern Hemisphere gets less
September Equinox
September 22-23(Both ends of Earths rotation are equal distances from the Sun)~ 12 hours of day and Night~ Fall stars~ in the Northern Hemisphere /~Spring starts~ in the Southern Hemisphere
Soltice
The Earth's rotation axis is tilted directly toward or away from the Sun
Why does Earth Orbit the Sun?
The Suns gravity pulls on Earth
Rotation Axis
The line on which the object rotates
How do the moon and the sun affect Earth's oceans?
The moon's gravity pulls the ocean toward it during high high tides
Revolution
The motion of one object around another object
orbit
The path an objects follows as it moves around another object
What is the Sun's Apparent Motion?
The sun moving across the sky from east to right (Left -Right)
Why do seasons change as Earth moves around the Sun?
The tilt of the Earth's rotation axis and Earth's motion around the sun.
Why does the Earth become more tilted?
When you move away from the equator and toward the poles.
What keeps the planets in orbit around the sun?
gravity
How does the earth move?
rotation and revolution (it spins around the sun)
What causes the yearly cycle of seasons?
the rotation axis is toward or away from the suns changes/
Why is Earth warmer at the equator than at the poles?
the sun's rays hit the earth's surface at a higher angle at the equator.
What direction does the Earth rotate?
west to east (Right to left)
Equinox
when Earth's rotation axis is leaning along Earth's orbit but is tilted neither toward nor away from the Sun
What is a solar eclipse?
when the Moon's shadow appears on Earth's surface
What is a lunar eclipse?
when the moon moves into Earth's shadow
