chapter one test review Flashcards
(26 cards)
When does earth make one complete revolution?
Every 365.24 days.
What is revolution?
The movement of the earth around the sun.
What is rotation?
The spinning of the earth around its axis.
how do we have day and night?
One complete rotation of the earth on its axis causes day & night.
How do we have seasons?
The tilt of earths rotation axis combined with Earth’s motion around the sun causes seasons.
What is a solstice?
A day when earths rotation axis is the most toward or away from the sun.
What is an equinox?
A day where earths rotation axis is leaning along earths orbit neither toward nor away from the sun.
What is the autumnal equinox?
When the north end of the rotation axis points towards the sun more and more.
What is the summer solstice?
The north end of the rotation axis continues to point toward the sun but does so less and less.
What is the vernal equinox?
The north end of the rotation axis now points more and more away from the sun.
What is the winter solstice?
The north end of the axis points away from the sun less and less.
Why do we see the moon?
The light from the sun reflects off the moon and into your eyes.
What’s the moons diameter?
27% of the earths diameter.
How did the moon form?
An object the size of mars collided with earth. The impact ejected vaporized rock that formed a ring around earth. The material in the ring cooled and clumped together, forming the moon.
What is Maria?
The large, dark, flat areas on the moon.
What are highlands?
The light colored areas of the moon.
How long is one rotation around the moon?
27.3 days.
What is a solar eclipse?
When the suns shadow is on the moon.
What is a lunar eclipse?
When the moon is in the earths shadow.
What is the difference between partial and total?
Partial is when the shadow is in the penumbra and the total is when the shadow is in the umbra.
Why don’t solar eclipses happen every month?
They can only occur during a new moon. The axis is titled slightly so everything doesn’t always end up in a straight line.
Why don’t lunar eclipse occur every month?
Lunar eclipses can only occur during a full moon.
What’s a tide?
The daily rise and fall of sea level.
What causes earths tides?
The difference in the strength of the moons gravity on opposite sides of earth causes earths tides.
