Ch.24 Quiz Study Guide Flashcards
What causes earths seasons?
The earths tilt on its axis. When tilted towards it is summer. When tilted away it is winter.
What are sunspots and what cause them?
They are dark cool spots the sun gets. They are caused by its magnetic field.
Earths shadow has two parts: What are they and what describe them?
The two parts are umbra and penumbra. Umbra is complete shadow and penumbra is partial shadow.
What shields earth from harmful solar radiation?
Earths magnetic field.
What month does northern hemisphere summer solstice occur?
June
What occurs when a new moon passes directly between the earth and sun?
Solar eclipse
The moons surface has been struck by meteorites causing?
A crater
The more massive an object the greater its?
Gravity
Lunar Maria is made of?
Basalt and lava
The violent eruptions that release huge amounts of energy?
Solar flare
4th state of matter that is made of super heated gas with a positive electrical charge?
Plasma
Cooler, darker areas on the sun?
Sunspot
Earths orbital shape?
Elliptical or ellipse
What is earths only natural satellite?
Moon
Which is hotter chromosphere or photosphere?
Chromosphere
What are solar prominences?
Large, bright feature extending out from sun.
When does summer solstice occur?
June 20
What is a lunar eclipse?
When earths shadow covers the moon. The earth is between sun and moon.
What are terrace areas like on moon?
Light color highland
Is earth the only planet known to have water?
No
How did the mountains on the moon form? Describe them.
Asteroids crashed into them. There on the rim of craters, they are crystallized and lightly colored.
What forms the magnetic field of earth?
Movement of molten metal.
What are solar flares and what can they do?
They are exploding out of suns surface. They release large amount of radiations. They can ruin things and power grids and communication.
What is the visible surface of sun called?
Photosphere
The sun moves which way across the sky?
East to West
Why does the sun have less effect on the tides than the moon?
It is farther away.
What do we know about moons temperatures? Far side of moon? Water?
The moon is either very hot or very cold. The far side of the moon has only been seen by spacecraft. There is ice in deep craters.
