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earth science > Earth’s Rotation > Flashcards

Earth’s Rotation Flashcards

1
Q

Is the earth in inconsistent motion

A

No the earth is in constant motion

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2
Q

What is a revolution?

A

A revolution is the earths motion around the sun

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3
Q

How often a revolution happen?

A

Once every year of 365 days

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4
Q

What is the earths spinning on its axis called?

A

A rotation

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5
Q

How often does a rotation happen

A

Once every 24 hours

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6
Q

What is revolving around the Center of the galaxy

A

The sun

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7
Q

Therefore what does the earth do

A

The earth follows the sun

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8
Q

Fill in my years blank
The______ is most likely moving through__________

A

The galaxy is most likely moving through space

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9
Q

What does the first law of motion prove about the earth

A

That the earth continues in orbit year after year

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10
Q

What is inertia

A

The tendency for an object to stay in its motion

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11
Q

What 2 forces toconsider in the earths orbit is what

A

The earths forward motion and the suns gravitational pull

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12
Q

The equator of the earth has a greater diameter than what?

A

Any other section of the earth as you near the poles

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13
Q

Since the earth is spinning this means what about the equator and poles

A

The equator has to be traveling at a greater speed than the earth near the poles

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14
Q

The earth spins roughly how many miles per hour at the equator?

A

1000 mph

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15
Q

How many mph does the earth spin at 35 degrees N and S latitudes

A

870 mph

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16
Q

The earths different speeds is seen in what 2 things

A

Global winds and missiles

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17
Q

As winds move North and South over the earth they tend to do what?

A

To tail off to the east or west

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18
Q

Why is this?

A

Because they are traveling at a greater or lesser speed than the earth

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19
Q

Just as a quarterback must throw a football in front of a moving receiver, a missive shot from the us to a country where must lead the country

A

On the equator

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20
Q

What is this effect called

A

the coriolis effect

21
Q

What is a Foucault pendulum?

A

A swinging ball on a long cord

22
Q

As the ball swings what keeps it in a straight line

A

It’s inertia

23
Q

As the ball swings in a straight line,what does the earth do

A

Rotates underneath it

24
Q

The appearance is that the ball swings through a what in what period of time?

A

Through a full circle every 24 hr/one full rotation

25
Q

What is an ecliptic path?

A

the apparent path of the sun through the stars

26
Q

What is the apparent travel caused by?

A

Our traveling around the sun so we ‘see’ different stars behind the sun

27
Q

True/False this is eveidence for only the heliocentric theory

A

False

28
Q

What is the first best evidence for the earths revolution

A

Seasons

29
Q

Why is the earth actually closer to the sun in January the reason that we gave winter?

A

Because the tilt of the earth

30
Q

The earth is tilted how many degrees?

A

23.5 degrees

31
Q

The axis of the earth always points at where

A

The North Star

32
Q

Where is North America tilted during winter?

A

Away from the sun

33
Q

Where is North America tilted during summer

A

Toward the sun

34
Q

During what 2 seasons is the side of the earth to the sun

A

Fall and spring

35
Q

During what season is the sun at 23.5 N

A

The sun is at 23.5 degree N during summer

36
Q

During fall and spring what degree is the sun at

A

The equator/0 degrees

37
Q

During winter the sun is in what hemisphere name degrees too

A

Southern hemisphere 23.5 S

38
Q

What is the longest day of the year(Give two names)

A

Summer solstice on June 21

39
Q

What is September 21 also known as ?

A

Autumnal equinox

40
Q

What day is the vernal equinox in

A

March 21

41
Q

What is one thing in common with fall and spring concerning the length of the days

A

They have a both equal (12 hr)day and night

42
Q

What js December 21 also known as(2)

A

Winter solstice, shortest day of the year

43
Q

Which seasons are in the Tropic of Cancer?

A

Summer

44
Q

Which season is in the Tropic of Capricorn

A

Winter

45
Q

Based on what 2 things does the sun change positions in the sky

A

Tilt and revolution

46
Q

Which tropic is the farthest north that the suns rays hit directly at what degree

A

Tropic of Cancer at 23.5 degrees north latitude

47
Q

What is The tropic at Capricorn?

A

The Tropic for the south that the suns rays hit directly at 23.5° south latitude. 

48
Q

What is another evidence of earth’s rotation

A

Parallax

49
Q

What is parallax

A

Parallax is the observed displacement of an object caused by the change of the observer’s point of view

earth science (10 decks)

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