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SCIENCE > Earth in Space > Flashcards

Flashcards in Earth in Space Deck (15):
1

Astronomy

the study of the moon, stars, and other objects in space.

2

axis

the imaginary line that passes through Earth's center and the North and South poles.

3

revolution

the movement of one object around another object.

4

rotation

the spinning motion of Earth on its axis.

5

orbit

the path of an object as it revolves around another object in space.

6

What causes day and night?

The rotation. When Earth rotates east the sun appears and when its west it is night.

7

Why is an extra day added to February?

because the Romans added one day for every 4 years because the earth orbits around the sun in 365 1/4 days.

8

Each 24-hour cycle of day and night is called...

day

9

Why is it warmer near the equator than near the poles?

because the sun hits the equator directly but at the poles it hits only at a steep angle.

10

Why does Earth have seasons?

because its axis is tilted as it revolves around the sun.

11

True or False. When it is summer in the Northern Hemisphere it is winter in the Southern Hemisphere.

True

12

solstice

each of the two days of the year when the noon sun is farthest north or south of the equator.

13

equinox

Each of the two days of the year when neither hemisphere is tilted toward or away of the equator.

14

Give Info for:
1. summer solstice
2.Autumnual equinox
3. winter Solstice
4. Vernal Equinox

1. June 21, longest daytime, Northern hemisphere tilted to sun
2. Sept. 22, 12 hours day, no hemisphere tilted to sun
3. Dec. 21, 8 hours day, Southern Hemisphere tilted to sun
4. March 21, day/night are equal, Northern hemisphere tilted to sun

15

calendar

system of organizing time that defines the beginning, length, and divisions of a year.