How many motions does the earth have? Which are they?
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Minimally, 2.  Depending on how simplisticly we are thinking about the problem.\n\n1) the Earth rotates around it's axis\n2) the Earth revolves (orbits) around the sun\nhttp://www.ucolick.org/~bolte/AY4_00/week1/motionsC.html\n\nMaximally: ???\n3) the Earth and Moon really form a system together which revolves around the sun so there is the wobble attributable to that interaction.\nhttp://search.yahoo.com/search?ei=utf-8&fr=slv1-&p=earth%20moon%20system%20motion\n\n4) the Earth precesses about it's axis changing the tilt relative to the orbital plane\nhttp://csep10.phys.utk.edu/astr161/lect/time/precession.html\n\n5-14) Perturbations in Earth's motion due to gravitational pull from other planets (Mercury, Venus, Mars, Jupiter, Saturn, Neptune, Pluto, UB313).\n\n15) Solar system motion through the Milky Way galaxy which brings the Earth along with it\n\n16) Motion of Galaxy through the universe bringing along the solar system and earth.\n\n17) Changes in motion due to sloshing of the oceans and earthquakes.\n\n...
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How fast is the Earth spinning?0.5 km/sec\n   •How fast is the Earth revolving around the Sun?30 km/sec\n   •How fast is the Solar System moving around the Milky Way Galaxy?250 km/sec\n   •How fast is our Milky Way Galaxy moving in the Local Group of galaxies?300 km/sec
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the Earth 3rd planet from the sun; the only planet were life exists; the Earth moves around the sun.\n\nto know more about the earth or the astronomy and space contact me :)
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the rotation of the earth and the semisic activity
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Currently, the earth's north magnetic pole moves about 40 kilometers per year.  The rate has varied considerably; it was only 10 km per year a century ago.
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The average distance from the Earth to the Sun is 149,597,890 km. Therefore in one year the Earth travels a distance of 2*Pi*(149,597,890)km. This means that the velocity is about: \n\nvelocity=2*Pi*(149,597,890)km/ year\n\nand if we convert that to more meaningful units (knowing there is 365 days in a year, and 24 hours per day) we get: \n\nvelocity=107,300 km/h (or if you prefer 67,062 miles per hour) \n\nSo the Earth moves at about 100,000 km/h around the Sun (which is 1000 times faster than the speeds we go at on a highway!)
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The Earth is about 12,750 kilometers (km) in diameter.\n\nHere are some answers to some more of your questions:\n\nHow old is the earth?\nThe earth is about 4.5 billion years old. That is 45,000,000,000 years. The sun, the moon, the planets, and nearly everything in our solar system was formed at the same time, so they are all 4.5 billion years old. \nHow does the earth spin?\nIf you look around at planets, stars, and galaxies in the universe you will see that EVERYTHING spins! This is because planets like Earth (and stars and galaxies) formed from a large cloud of gas and dust. As gravity pulled the cloud together, any little bit of spin gets multiplied. This is known to scientists as the Conservation of Angular Momentum. You can try this out yourself. Find a chair that spins easily and sit on it. Start out by spinning with your arms outstretched, then pull them in to your body. Did you notice that the chair started to spin faster when you pulled your arms in? The same thing happens as the planet forms — as its gas, dust, and rocks fall together the planet spins up faster and faster. Later other things can affect the spin. Earth and the moon pull on each other, affecting both their spins and the orbit of the moon. It's quite a dance! \n\nHow fast is the earth spinning and why can't we feel it spin?\nThe circumference of (distance around) the earth is 2 x PI x radius, which turns out to be about 24,000 miles. Since the earth turns once per day (or 24 hours), that is 1,000 miles per hour! We don't feel that because everything else is moving with us and because the motion is very, very smooth. It's kind of like sitting in a car and reading a book or playing a game. If the car is going very smoothly, with no stops or bumps, and you don't look out the window, you wouldn't know you were moving. The only reason we know the earth is turning is because the sun and stars move across the sky. \n\nWhat is the exact tilt of the earth? How much does it change throughout the year?\nThe tilt of the earth is 23.45 degrees. This is measured as the tilt of the earth's equator compared to its orbit around the sun. The amount of the tilt doesn't change with time, but the direction that the earth's poles are pointed does. This is called precession. It is just like the wobbling of a spinning top. The direction that the North Pole (and South Pole) is pointed moves in a circle in the sky very slowly, completing each circle once every 26,000 years. \n\nWhy does only Earth have so much oxygen?\nThat's a very good question — no other planet in the solar system has so much oxygen. The answer is — life! Earth did not originally have a lot of free oxygen in the atmosphere. The oxygen was mostly combined with other elements to make carbon dioxide, water, or in rocks. But as early life evolved, especially plants, well they give off oxygen. So the reason we have so much oxygen in our atmosphere — and we are here and can breathe it! — is due to plant life on the earth! \n\nHow can rockets get through the earth's atmosphere, but comets can't?\nObjects hitting our atmosphere usually burn up because they are hitting it so fast. Usually they are moving at hundreds or thousands of miles per second. Rockets and the shuttle move more slowly (although pretty fast compared to cars on the highway). Here's a comparison. If you jump into a swimming pool from the high board and hit the water really hard, it stings and you make a big splash. But if you step into the water slowly, it feels fine and you make only a little ripple. The same thing happens to meteors — they hit the earth's atmosphere real hard and go splat! \n\nIf a comet hit the earth, what would happen?\nIt could cause a big explosion. The nucleus of a comet is thought to be a mile or two in size. The nucleus is made up of ice and rock, but we aren't sure how solid it is. Something that big hitting the earth from space would be bigger than
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It takes the Moon 27.322 days to go around the Earth once. Because of this motion, the Moon appears to move about 13° against the stars each day, or about one-half degree per hour. If you watch the Moon over the course of several hours one night, you will notice that its position among the stars will change by a few degrees.
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How many continents are on the earth?\nA continent is one of several major land masses on the earth. There is no standard definition for the number of continents but you'll commonly find that the numbers six or seven are used. By most standards, there are a maximum of seven continents - Africa, Antarctica, Asia, Australia, Europe, North America, and South America. Most students in the U.S. are taught that there are seven continents.\n\nIn Europe, many students are taught about six continents, where North and South America is combined to form a single America. Thus, these six continents are Africa, America, Antarctica, Asia, Australia, and Europe.\n\nMany geographers and scientists now refer to six continents, where Europe and Asia are combined (since they're one solid landmass). Thus, these six continents are Africa, Antarctica, Australia, Eurasia, North America, and South America.
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Planetary motion is the motion of the planet itself around its axis\n--> spinning earth\nOrbital motion is the motion of an object around another object in space.\n--> Moon on its path around earth\n--> Earth on its path around the sun
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There are 880, up to reflections and rotations. Check out the bit near the bottom of the webpage below.
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1. Earth's rotation is the reason we have days and nights. Without Earth rotating the sun would shine on one place only and the other side of the planet would be in the dark. Rotation is also the possible reason for its magnetic field.\n\n2. Earth's revolution is the reason for seasons and gravity.
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Hint: The Earth revolves 7.5 degrees every 30 minutes.
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We know that the Earth is 360 degrees(as the Earth is a sphere). Now the Earth takes about 24 hrs to complete a rotation or 360 degrees. Therefore in 1 hour, it will travel 15 degrees. But some times countries are so small that they don't even occupy 15 degree area. So its half - 7.5 degrees is taken into consideration. The main purpose of taking all this trouble is to make the calculation of time easier.
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Speed of Earth's rotation at the equator is 0.46 km/s.\nSpeed of Earth's revolution around the sun varies from 29.29 to 30.29 km/s because of it's elliptical orbit.\nThe speed of the Sun's rotation at the equator is 2.0 km/s.
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For one thing, it takes the earth 24 hours to complete one full rotation, and the earth has circumference of roughly 24,000 miles, which means the speed of its rotation is appx. 1000 mph...\n\nSo if we did not have a protective atmosphere as we do, winds could be up to 1000 mph. Fortunately we do, so the winds we do experience are usually negligible...
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The Earth rotates (spins around).  Sometimes a side is facing the Sun and is in daytime.  Sometimes it is not and is in nighttime.