ES18A ES19A Test

Earth ________ on its axis once a day.
1. revolves
2. rotates
3. remits
4. reduces
Day and night are caused by ___________.
1. Earth's revolution of the moon
2. the moon's tilt
3. Earth's tilt of 23.5 degrees
4. Earth's rotation on its axis
In an eclipse, if you are in the _____________ the sun is totally blocked out.
1. orbit
2. bright side
3. penumbra
4. umbra
Earth's rotation is about once every __________ .
1. 24 hours
2. 365.25 days
3. 29.5 days
4. 365 days
The same length of daytime and night happens during the __________.
1. equinox
2. solstice
3. spring solstice
4. autumnal solstice
Earth ____________ around the sun once a year.
1. equinox
2. eclipses
3. rotates
4. revolves
We see the moon in its ______________ when it is lit by the sun at different times in its orbit around Earth.
1. revolution
2. solstice
3. phases
4. equinox
The darkest part of the eclipse is the __________________ .
1. penumbra
2. orbit
3. umbra
4. slider
When the sun's rays are the most direct it is _____________ in the Northern hemisphere.
1. summer
2. fall
3. spring
4. winter
The solstice happens ___________ a year.
1. three times
2. twice
3. once
4. four times
There are ________ high tide(s) and __________ low tide(s) every day .
1. 2, 2
2. 1, 1
3. 4,4
4. 2, 4
During a solar eclipse, the __________ is hidden in shadow.
1. Earth
2. asteroid
3. sun
4. moon
You can watch a __________ eclipse without special equipment.
1. solar
2. lunar
3. windy
4. spiral
The word __________ comes from the Greek word for "wanderer"
1. sun
2. solar
3. planet
4. star
Ptolemy made a model of the solar system with Earth in the center with a _______ model.
1. universal
2. heliocentric
3. global
4. geocentric
Copernicus made a model of the solar system with sun in the center with a _______ model.
1. global
2. heliocentric
3. universal
4. geocentric
A planet orbits the sun in a(n) _____________.
1. ellipse
2. season
3. circle
4. day
The part of the sun we see is the ______________.
1. photosphere
2. stratosphere
3. chromosphere
4. corona
The sun’s ________ contains the chromosphere, photosphere and the corona.
1. atmosphere
2. photosphere
3. photosphere
4. chromofore
The part of the sun we see is the ________, the surface of the sun.
1. stratosphere
2. corona
3. chromosphere
4. photosphere
During a total eclipse, you can see the ________ flying millions of kilometers out into space.
1. solar wind
2. solar icons
3. sun spots
4. solar fluid
The two things that keep planets in orbit are inertia and ________.
1. light
2. space
3. gravity
4. heat
The tendency for a moving thing to keep moving in a straight line is ____________.
1. space
2. heat
3. inertia
4. light
Sunspots are _______ parts of the sun.
1. wet
2. dryer
3. warmer
4. cooler
Solar wind could harm astronauts and disrupt ________.
1. satellites
2. sunspots
3. flares
4. seasons

ES18A ES19A Test

Select the best answer.