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EXAM STUDY TIME, sun, moon, and seasons
Unit 1
27
Science
9th Grade
07/27/2009

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Cards

Term
What are sunspots?
Definition
Magnetic disturbances found on the photosphere, they are cooler than the surroundin gases
Term
How many times would the Earth fit into the sun?
Definition
More than one million.
Term
What state of matter is the sun?
Definition
plasma.
Term
What is the hottest layer of the sun?
Definition
The core.
Term
What takes place in the convection zone?
Definition
Gases rise and fall, before the energy is taken into place.
Term
What is the photosphere?
Definition
The visible layer of the sun.
Term
What are the layers that make up the sun's atmosphere?
Definition
The chromosphere and the corona.
Term
When is the corona visible?
Definition
During a solar eclipse.
Term
What causes and aurora?
Definition
Solar wind particles interacting with Earth's magnetic field.
Term
Where on earth are auroras visible?
Definition
Near the magnetic poles.
Term
How did the moon form?
Definition
A chunk of the Earth went into orbit around the earth.
Term
How did mountains form on the moon?
Definition
The ground was thrust upwards by the force of an impact.
Term
Why is the moon considered inactive?
Definition
It is a solid rock (no plant life) and has no volcanic activity.
Term
Why do we only see one side of the moon?
Definition
The moon completes a rotation and an orbit at the same time.
Term
What are lunar Maria?
Definition
Large dark spots on the moon.
Term
What did scientists discover when they brought back moonrocks from the Mare?
Definition
The rocks resembeled basalts in lava flows.
Term
Why are higlands on the moon brighter than the Mare?
Definition
They reflect more sunlight.
Term
What is the shape of the moon's orbit around the earth?
Definition
Elliptical.
Term
What does a waxing moon mean?
Definition
It is changing from dark to light.
Term
What does a waning moon mean?
Definition
Changing from light to dark.
Term
What is a lunar eclipse.
Definition
When the moon passis into Earths umbra.
Term
Why do we have seasons?
Definition
The earth's is on an angle, and it rotates around the sun.
Term
Why are the northern and southern hemispheres in different seasons?
Definition
They Earth is tilted, so when one hemisphere is facing the sun, the other hemisphere is facing away.
Term
When does the sun rise directly from the east and set directly in the west?
Definition
On the spring or fall equinox.
Term
Why are summer days hotter than winter days?
Definition
The hemisphere is in direct sunlight(tilted towards the sun) in the summer.
Term
In the northern hemisphere, which season is the earth closest to the sun?
Definition
Winter.
Term
When is the:
Vernal equinox
Summer solstice
Autumnal Equinox
Winter solstice
Definition
On:
March 21st
June 21st
September 21st
December 21st
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