Science test 10.28.26
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25 Terms
What causes Earth's seasons?
Earth's axis is tilted as it revolves around the Sun.
What is Earth's axis tilt?
23.5 degrees.
What mainly causes seasonal temperature differences?
The tilt of Earth's axis.
What would happen if Earth's axis were not tilted?
Temperatures in a given area would remain more constant year-round, and there would be no seasons.
What is Earth's revolution?
Earth moving around the Sun.
When is the Northern Hemisphere tilted toward the Sun?
Around June; the Northern Hemisphere experiences summer.
When is the Northern Hemisphere tilted away from the Sun?
Around December; the Northern Hemisphere experiences winter.
What seasons does the Southern Hemisphere have when the Northern Hemisphere has summer?
Winter; the hemispheres have opposite seasons.
What happens in March and September?
Sunlight strikes both hemispheres more equally, bringing spring or autumn conditions.
How does axis tilt affect day length?
The hemisphere tilted toward the Sun has more hours of daylight than darkness.
Where are day-length changes most drastic?
Near the poles.
What happens in Kiruna, Sweden, during much of January?
The Sun stays below the horizon throughout the day.
What happens in Kiruna, Sweden, in June?
The Sun never fully sets.
What is a solstice?
A day when a hemisphere has its strongest tilt toward the Sun; it marks the start of a season.
When is the Northern Hemisphere summer solstice?
Around June 21.
When is the Northern Hemisphere winter solstice?
Around December 22.
When do the Northern and Southern Hemispheres have solstices?
At opposite times of the year.
What is an equinox?
A day when neither hemisphere is tilted toward the Sun.
What does equinox mean?
“Equal night.”
What happens to day and night at an equinox?
Day and night are both about 12 hours long.
Where is the Sun directly overhead at noon during an equinox?
At the equator.
When is the Northern Hemisphere spring equinox?
Around March 21.
When is the Northern Hemisphere fall equinox?
Around September 22.
When do equinoxes occur in the two hemispheres?
At opposite times of the year.
What does a solstice or equinox mark in the lesson?
The first day of a season.