Earth’s Motions & Tides
What are the two ways Earth moves in space?
Rotation and revolution
What causes the seasons?
What is Earth’s tilt and revolution around the Sun
What is a solstice?
The day with the longest or shortest daylight of the year
What force pulls objects toward each other?
Gravity
Why can we see the Moon?
Sunlight reflects off its surface
The spinning of Earth on its axis?
What is Earth’s rotation
What is Earth’s tilt?
What is About 23.5 degrees
What is an equinox?
A day when day and night are nearly equal in length
What two factors affect gravitational force?
Mass and distance
What is the umbra?
The darkest part of a shadow
What are the two main types of tides?
Spring tides and neap tides
Which season receives the most direct sunlight?
What is Summer
What event occurs around June 21 in the Northern Hemisphere?
Summer Solstice
Which has stronger gravity: Earth or the Sun?
The Sun
What does waning mean?
The illuminated part of the Moon is shrinking
What causes day and night?
What is Earth’s rotation
Why are seasons opposite in the Northern and Southern Hemispheres?
What is Because Earth’s tilt points one hemisphere toward the Sun while the other points away
During an equinox, how many hours of daylight and darkness are there?
About 12 hours each
What is an orbit?
The curved path of one object around another
What is a solar eclipse?
When the Moon blocks sunlight from reaching Earth
How long does one Earth revolution take?
What is 365.25 DAYS
What happens to daylight length during summer?
What is Days become longer
What causes changes in daylight length throughout the year?
Earth’s tilt & direction of tilt as it revolves around the Sun
What keeps planets in orbit around the Sun?
Gravity
Why don’t eclipses happen every month?
The Moon’s orbit is tilted compared to Earth’s orbit