Chapter 7- Our Solar System

Gravity- the force of attraction, or pull between any two objects
The strength is affected by
The total ______of the two objects
The ______between the two objects
Orbit- the path one object takes around another object.
______prevents the planets being pulled into the sun.
Inertia- the tendency of a moving object to keep moving in a straight line.
Because of gravity and inertia Earth moves in a nearly circular orbit called an ______.
Earth orbits around the ______.
A revolution is one complete trip around the Sun. This is 365 1/4th days.
Seasons occur because ______strikes different parts of Earth at different angles.
The Earth is tilted at a ______degree axis.
An axis is a straight ______in which an object spins. (imaginary)
Earth’s axis is the ______and the ______.
As Earth revolves around the Sun, the tilted axis always points in the same ______.
Winter occurs when the Northern Hemisphere is tilted away from the Sun. The ground doesn’t get much heat. (in the Southern Hemisphere this would be summer)
Summer occurs for the Northern Hemisphere with it is tilted towards the Sun. (the ground receives more heat energy and the temperatures are warmer) (This would be winter for the Southern Hemisphere)
Earth moves through space at 19 miles per second.
Earth ______at 1000 miles per hour.
One complete rotation of Earth is ______hours.
Day is when the that portion of the Earth is facing the Sun.
Night occurs when that portion of the Earth is facing away from the Sun.
Earth rotates from ______to ______.

Lesson 2

______was the 1st person to walk on the Moon in ______.
The Moon has no ______, ______, or ______.
How were the craters on the Moon made? ______
A phase of the Moon with the appearance and shape of the Moon as you see it at a particular time. It depends on the Moon’s ______in relation to the Earth and the Sun.
From one phase to the next same phase is ______days.
Eclipses- when one object moves in front of another object in space.
A solar eclipse- occurs when the Moon passes directly between the ______and the Sun.
A solar eclipse only occurs during a ______phase.
A lunar eclipse- occurs when the Moon moves into the Earth’s ______and is no longer reached by direct sunlight.
Lunar eclipses happen only during full moon phases.
The area where sunlight is completely blocked is called the ______.
The area where sunlight is partially blocked is the ______.
A ______solar eclipse is when darkness covers the entire face of the Sun.
A ______solar eclipse occurs when darkness covers only part of the Sun.
A ______is the pull of water caused by gravity. It is the rise and the fall of the ocean’s surface.
______occur when the Sun and Moon line up and pull in the same direction and causes higher high tides and lower low tides.
______occurs when the high tides are lower than usual and the low tides are higher than usual.