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Flashcards in Science Deck (13)
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1
Q

Until the 1500’s, most people believed that the Earth was _______________ and that the sun and the stars _______________ around the earth.

A

flat; orbited around

2
Q

What do we believe now about how the movement of the sun and the Earth?

A

The Earth revolves (or orbits) around the sun.

3
Q

Describe the rotation of the Earth.

A

The Earth is spinning on its axis, which are the North and South Poles. One rotation of the Earth takes 24 hours (or 1 day).

4
Q

Describe the Earth’s revolutions.

A

As the Earth is rotating (or spinning) it is also orbiting (or revolving) around the sun. One revolution of the Earth around the sun takes 365 ¼ days (or 1 year).

5
Q

What is a lunar month?

A

The time it takes for the moon to pass through all of its phases.

6
Q

About how many days does it take for the moon to orbit around the Earth?

A

Around 27 days

7
Q

About how many days is one lunar month?

A

About 29 days

8
Q

Draw a diagram illustrating the phases of the moon.

A

[Show Teacher]

9
Q

What are tides?

A

Changes in Earth’s water level (of the oceans and seas)

10
Q

What causes the Earth’s tides?

A

The gravitational pull of the Moon and Sun.

11
Q

Describe and draw a Spring Tide.

A

Moon and Sun are pulling in the same direction. This tide has the greatest tidal variation. [have Teacher check drawing]

12
Q

Describe what is meant by “greatest tidal variation”.

A

It has both the highest and the lowest tides.

13
Q

Describe and draw a Neap Tide.

A

Moon and Sun are pulling at right angles to each other. [have Teacher check drawing]