Economicos
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Publicado: 8 de octubre de 2011
•
LEARN ABDUT
The Seasons
FIND OUT
How Earth Moves in Space
]
• why there are seasons • what causes day and night
VOCABULARY
rotation axis revolution
You are sitting readingthis book. It seems like you are still. But you're not. Earth is traveling through space at almost 107,800 kilometers (67,000 mi) per hour. You are moving with Earth. You are also flying around thesolar system as Earth orbits the sun. Earth moves in two ways. First, Earthspins like a topo This is called rotation. Rotation (roh»TAY»shuhn) istíie spinning of an object on its axis. Earth's axis(AK»sis) is an imaginary line that^o^stln^ou^jh^^ JjoxtJiJoj^ndThe bóumPoler Earth rotates on its axis once every 24 hours. One rotation takes one day. Earth also circles the sun. This is called revolution.A revolution (rev»uh»LOOshuhn) is the moyement_i one object around another object. Earth makes one revolution around the sun every 365^ days. One revolution takes one year.
Earth rotates on itsaxis as it revolves around the sun. •
D68
A Both Earth and the moon rotate. The Earth rotates once a day. The moon rotates about once a month.
The moon also rotates and pevolves. It rotates onits axis. It ievolves around Earth. A day on the Inoon, or one rotation, is about 29 Earth days long. The moon takes this ¡same amount of time to revolve around Earth. Objects on Earth cast shadows©Shadows can help us observe Earth's potationr As Earth rotates, the sun's bosition seems to change in the sky But it is really the Earth that is inoving.
In the morning the sun seems low in the sky.Objects cast long shadows. As the Earth rotates, the sun seems to move higher in the sky. Shadows get shorter. At noon, the sun is overhead. Objects cast short shadows—or no shadows at all. As Earthcontinúes to rotate, the sun looks lower in the sky again. Shadows get longer until the sun setsc
> What is rotation? /
Shadows are short at noon. They're longer at 2:00 P.M. because the sun...
LEARN ABDUT
The Seasons
FIND OUT
How Earth Moves in Space
]
• why there are seasons • what causes day and night
VOCABULARY
rotation axis revolution
You are sitting readingthis book. It seems like you are still. But you're not. Earth is traveling through space at almost 107,800 kilometers (67,000 mi) per hour. You are moving with Earth. You are also flying around thesolar system as Earth orbits the sun. Earth moves in two ways. First, Earthspins like a topo This is called rotation. Rotation (roh»TAY»shuhn) istíie spinning of an object on its axis. Earth's axis(AK»sis) is an imaginary line that^o^stln^ou^jh^^ JjoxtJiJoj^ndThe bóumPoler Earth rotates on its axis once every 24 hours. One rotation takes one day. Earth also circles the sun. This is called revolution.A revolution (rev»uh»LOOshuhn) is the moyement_i one object around another object. Earth makes one revolution around the sun every 365^ days. One revolution takes one year.
Earth rotates on itsaxis as it revolves around the sun. •
D68
A Both Earth and the moon rotate. The Earth rotates once a day. The moon rotates about once a month.
The moon also rotates and pevolves. It rotates onits axis. It ievolves around Earth. A day on the Inoon, or one rotation, is about 29 Earth days long. The moon takes this ¡same amount of time to revolve around Earth. Objects on Earth cast shadows©Shadows can help us observe Earth's potationr As Earth rotates, the sun's bosition seems to change in the sky But it is really the Earth that is inoving.
In the morning the sun seems low in the sky.Objects cast long shadows. As the Earth rotates, the sun seems to move higher in the sky. Shadows get shorter. At noon, the sun is overhead. Objects cast short shadows—or no shadows at all. As Earthcontinúes to rotate, the sun looks lower in the sky again. Shadows get longer until the sun setsc
> What is rotation? /
Shadows are short at noon. They're longer at 2:00 P.M. because the sun...
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