why is the earth round and is the cor of the earth made of magma?

Answer 1

A lot like a jagged rock in the ocean that soon becomes a smooth pebble... so are we in the universe.

Answer 2

What makes the earth round is gravity.

The earth is big enough that its shape can overcome the natural rigidity of the materials it's made from, and it pulled itself into its present rough spherical shape in much the same way that a droplet of water suspended in the air is a sphere shape.

What makes the earth bulge outwards slightly at the equator is a combination of its rotation, which causes the equatorial region to spin out through centripteal forces ever so slightly, and the minuscule effects of tidal forces on the earth of the Moon and even the Sun.

Finally, the earth's core and mantle are semi liquid because of intense heat generated in the interior, a lot of which is caused by radioactivity from unstable nucleides in the core. Radioactivity keeps the temperature of the interior high - at the core, it is estimated to be hotter than the surface of the Sun's photosphere.

It's also that nuclear - powered heat which drives the tectonic plates, which in turn gives us our volcanoes, earthquakes - and our atmosphere, because without the volacnoes billions of years ago, we'd not have had an atmosphere at all.

Answer 3

Gravity crunches a planet's mass into the smallest space it can. In a sphere, no part sticks further out from the center than any other part, so that's the most compact shape it can take. The pressure from all that weight crunching in and seeking the planet's center of gravity creates the heat that turns the rock at the core to liquify, becoming magma.

Answer 4

the modern measurements show the distance the earth is 40,024km at the equator. the earths diameter at the equator is12,758km slightly larger than its diameter pole to pole by 43km.The earth weighs 6,000 trillion trillion tonnes.The earth looks round but it is not a perfect sphere. The earth has a thin shell of solid rock called the crust, beneath the crust is a layer almost 3,000km deep called the mantle. below the mantle is a core of metal mostly iron and nickel. The outer core is so hot that the metal is always molten. The earths inner core is even hotter- up to 7000 degrees centigrade but the metal hereis solid because pressures here are so great that metal simply cant melt.

Answer 5

Regarding your first question....There were answers already given to a similar question. On your second question,...earth came into being as a molten and extremely hot solid body.....As millions of years went on, the top surface of the earth cooled and formed the earth's crust and as a result of this cooling were formed the first layers of atmosphere.....Millions and millions of years have passed now and the crust has deepened and its the same old molten part of the primitive earth that still exists as the magma.

Answer 6

The core of the earth is actually comprised of some iron and other metals.This helps to explain why the planets have magnetic fields. But the core is surrounded by a semi-molten mantle which is then covered by the crust.

Answer 7

Gravity pulling from the dense solid core causes the rest of the earth to be pulled into a sphere around it. Most planets are like this but some are actually slightly eliptical, kinda flat at each pole.

Answer 8

Most planetary bodies are round, because a sphere balances gravitational forces. The Earth is not round, but actually bulges at the equator due to the planet's rotation. We have no proof the centre is liquid iron, but soundings taken would suggest a high-pressure nickel core.

There are a couple of really good articles on Wikipedia which I've pasted below.

Answer 9

I'm sorry but I can't read the word magma without thinking about Dr Evil.

Answer 10

the core's not magma, the inner core is solid cuz the pressures too high, the outer core is made of stuff like nickel and iron, and the mantle is made of molten rock (in otherwords, magma)

Answer 11

its round because it feels like beuing round and yes the core is made of magma!