what are the two important motion of the earth describe each?
463527
There is rotation-the spinning of Earth on its axis\nAnd:\nThere is revolution-The orbiting of Earth around the sun
463369
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.
959085
the rotation of the earth and the semisic activity
1079808
Earth science is any of several essentially geologic sciences that are concerned with the origin, structure, and physical phenomena of the earth.
199932
The earth's rotation.
1077104
it is a geological term define as deformation of the earth's crust
448267
the average orbital velocity of earth is 29.783 km/s.\n\nhttp://en.wikipedia.org/wiki/Earth
58016
The thrust is irrelevant. This is a conservation of angular momentum problem so all you need is the momentum of the planes. When calculating the angular momentum of the earth, you need to multiply by a factor of 2/5 to make up for the fact that the earth is solid and not all of the mass is at the surface.\n\nyou can do the math yourself.
418207
Both are important, but the proper ratio of each is the most important.  I haven't had physics for so long...maybe you should also try the physics section so that some smart physicist will sit down and figure it out for you.
1097752
north ,south, east and west are compass directions\n \ndown is toward the center of the earth\n\nup is toward space
161923
Earth and all the other planets in the solar system revolve, or orbit, around the Sun due to the force of gravitation. The Earth travels at a velocity of about 107,000 km/h (about 67,000 mph) as it orbits the Sun.
1037132
Well, you need to take more than one law into account.  There's also the law of inertia; that an object in motion tends to stay in motion along a straight line unless another force acts on it.  In the earth's case, that other force is the sun's gravity.  As a result of the earth's own intrinsic motion and the sun's gravitational pull, the earth continues to orbit around the sun (though the sun is winning out, veeeerrrry slowly).  To disturb that equilibrium, you'd need a very large mass and/or a very high speed to overcome earth's inertia enough to knock it out of orbit.  While the impact of asteroids do have *some* effect, because asteroids come from every direction their cumulative effect evens out.  \n\nAn analogy would be walking outside on a windy day.  Normally, if there's no wind or an occasional breeze, it doesn't affect you much.  But if there's a strong wind coming from one direction then you get pushed by it, and a really strong gust can knock you over.
501091
layers in earths ORBIT, or layers in EARTH?\n\nthe earths orbit is the path taken by the earth as it circles the sun.
8760
None, the two are not related. Earth's rotation is a measure of time and light years are a measure of distance.
172943
The earth moves in many ways. For example:\n\n1. The surface of the earth exhibits earth tides, just like the surface of the oceans, because of the gradient of the gravity field the earth is in, due to the moon, sun and other celestial bodies (so there are usually about 2 high earth tides per day, and 2 low earth tides; they have an amplitude of a few feet). \n\n2. The ground moves due to earthquakes and volcanoes, etc.\n\n3. The ground moves due to the slow movement of tectonic plates\n\n4. The earth rotates on its axis (takes about 24 hours; this is slowing down because of the effect of the tides)\n\n5. The earth revolves around the sun (well the center of mass of the solar system actually, and it takes about 365.25 days to make one circuit)\n\n6. The pole of the earth precesses with a period of about 26,000 years (the direction the north pole points rotates)\n\n7. The axis of the earth bobs up and down while it rotates, called nutation (18.6 year period)\n\n8. The pole of the earth wobbles, called the Chandler Wobble (earth's pole moves in irregular circle of 3-15 m diameter with period of about 435 days) because of storms and other atmospheric and ocean redistributions of mass, and conservation of angular momentum. \n\n9. The earth's orbit around the center of mass of the solar system is elliptical, and the eccentricity of the ellipse varies with a period of about 100,000 years\n\n10. The axis tilt of the earth varies from 21.5 to 24.5 degrees with a period of about 41,000 years.\n\n11. The center of mass of the solar system varies a bit due to motion of the sun and the planets.\n\n12. The solar system as a whole moves in our galaxy about the center (a period of 225 million years, and moving at about 250 km/sec)\n\n13. The solar system bobs up and down in the limb of the Milky Way galaxy with a period of tens of millions of years\n\n14. Our galaxy is moving through space very rapidly (about 300 km/sec, but this depends on what you are measuring relative to; see references)
1040165
Convection, driven by the release of heat from the Earth's mantle.   Like a pot of vegetable soup on the stove.   The vegetables on the surface move around.   Some are subducted and others surface.
316427
None specifically. \n\nAll celestial bodies rotate.  The earth is no different.