Nile River - The longest river in the world south of the equator, eventually flowing through Egypt and draining into the Mediterranean sea.
Rotation - The rotation of earth around its own axis.
Revolution - The movement of one object around another object.
Calendars - A chart showing the days, weeks, and months of a particular year.
Seasons - The four divisions of the year, spring summer, winter, fall, marked by different weather.
Earths's Tilt - Earth's axis is tilted because of the seasons.
June - It's summer in the northern hemisphere and winter in the southern hemisphere.
December - It is summer in the southern hemisphere and winter in the northern hemisphere.
March and September - Neither end of earth's axis is tilted toward the sun. Both receive the same amount of energy.
Moon Motion - The moon is in motion when it is circling the earth and when earth tilts on it's axis, so does the moon.
Phases - The different shapes the moon makes. There are 8 phases of the moon.
Solar Eclipses - When the sun is blocked to the earth, this happens when the moon is between the sun and the earth.
Lunar Eclipses - When the sun is blocked to the moon, this happens when earth is directly between the sun and moon.
High Tides - When the tide of an ocean is at it's highest level.
Spring Tide - A tide with the most difference between low and high tides.
Neap Tides - A tide with the least difference between low and high tides.