|
<Dinosaurs>
<Insects>
<Easy Models: insects>
<Universe>
<Natural Science>
|
| Globe |
 |
 |
 |
|
| Moon measuring tape |
|
|
|
Download Guide (See Help)
• Globe: 1,132KB/A4 PDF, 1,569KB/US LTR PDF
• Paper Size: A4 or US letter; 13pages
• Orientation: Portrait
• Moon measuring tape: 647KB/A4 PDF, 692KB/US LTR PDF
• Paper Size: A4 or US letter; 8pages
• Orientation: Portrait |
|
|
Download Guide (See Help)
• 1,323KB/A4 PDF, 1,468KB/US LTR PDF
• Paper Size: A4 or US letter; 5pages
• Orientation: Portrait |
Information:
Some 4.6 billion years ago, gas and debris swirling around the fiery sun coalesced to form a sphere. As the layers of gas and debris finally separated and condensed, they formed small planetesimals, which repeatedly collided and combined with each other. These events led to the formation of the earth and the other planets in the solar system. The young earth was constantly impacted with planetesimals, the energy of these blows superheating areas near the surface of the earth and creating seas of magma. When the seas of magma finally began to cool, rain began to fall, condensing from dense water vapor and carbon dioxide released from the magma, forming the primordial seas.
Life first appeared in these primordial seas some 4 billion years ago. Multicellular organisms appeared 600 million years ago; human ancestors appeared 5 million years ago.
The sun and the moon are the heavenly bodies most familiar to those of us here on the earth. The moon formed approximately 4.5 billion years ago from the combination of fragments that broke off when a meteor the size of Mars struck the young earth. The moon’s diameter is about one-fourth that of the earth; its volume is around 1/50. It revolves around the earth at a distance equivalent to about 40 times the earth’s diameter. Use this globe not just to look at the earth’s continents, but to get a feel for the actual distance between the earth and the moon.
|
|
