- 4 May 2018
- Cosmos Category
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The Earth is a rotating sphere that orbits the Sun. The axis of rotation of the Earth is at a constant tilt with respect to its orbit around the Sun, thus resulting in the change of seasons. Iron and oxygen make up 65% of the Earth’s mass. The Earth also has gravity and magnetic force fields.
Our planet Earth is a rotating sphere that orbits the Sun. The Earth’s axis of rotation is at a constant tilt with respect to its orbit around the Sun, resulting in the change of seasons.
The physical characteristics of the Earth include its size and composition. The Earth also has gravity and magnetic force fields.
Geology / Age
Geography The Earth is the third planet from the Sun and the only object in the Universe known to harbor life.
Gravity is the force at a distance that attracts objects of mass toward each other. The force of gravity from the Earth holds down our atmosphere, oceans and everything else.
Some planets and moons that have less gravity than Earth have lost their atmosphere because it wasn’t sufficient to hold the gas close to the surface.
When you throw a ball or shoot a bullet upward, it will slow down due to the Earth’s gravity, until it finally falls back to the ground. You would have to shoot the object at 40,248 km/hr (25,009 mph) for it to escape the Earth’s gravity and fly out into space. This is called the Earth’s Escape Velocity.
The Earth is like a giant magnet with a magnetic pole near the North Pole and the opposite near the South Pole. The north pole of a magnet seeks the North Magnetic Pole. Through the ages, indications are that the poles switched directions. No one is sure why this happened.
The rotation of the Earth and the fact that the core of the Earth is made of iron are major factors in creating the magnetic field.
One thing the magnetic field does is to attract charged particles that have been emitted from the Sun. The focusing of these particles at the poles may help to prevent us from being harmed by the high energy particles.
These particles cause the air in the upper atmosphere to glow. This is called the northern lights (aurora borealis) or southern lights (aurora australis).
Earth’s axis of rotation is tilted with respect to its orbital plane, producing seasons on Earth. The gravitational interaction between Earth and the Moon causes ocean tides, stabilizes Earth’s orientation on its axis, and gradually slows its rotation. Earth is the densest planet in the Solar System and the largest of the four terrestrial planets.
On this little planet, about half a billion years ago LIFE ON EARTH arose