Let's suppose, just for sake of argument that you had a drill capable
of plowing below where you are standing right now and grinding its
way straight through the middle of the planet to the other side. Where
would you end up?
Surf on the Google map below, find where you want to dig your hole
and click there. After this, click on "Start Digging..."
and you will see the place where you going to end up.
Scientifically speaking it would be impossible to dig a tunnel through
to the other side of the world, but it’s fun to pretend! If
you attempted to dig a hole to the other side of the Earth, you would
be digging through:
» More than 12 000 kilometres of solid rock and
molten magma
» Rock reaching temperatures up to 6000 ºC
and
» Extreme pressures up to 300 million times greater
than the pressures we experience on the surface of the Earth!
Also, the Earth is not a perfect sphere. It is slightly flattened
at the poles, and bulges a little at the equator due to the Earth’s
spin. So technically, if you dig a tunnel through to the other side
of the globe, you would not come out at the place shown on a Google
Map which is an almost perfect sphere.
If you did somehow manage to dig a hole to the other side of the Earth,
would you fall through?
Again, theoretically no! The Earth continues to spin as you fall,
gravity changes as you fall to the Earth’s centre and friction
would slow you down. If you ignored all of these factors, scientists
think it would take about 42 minutes to fall through the tunnel.
More Readings
Scientific American
Ask the Experts 21 April 2003
Would you fall all the way through a theoretical hole in the earth?
Scientific American April 21,
www.sciam.com
New Scientist
The Last Word
If you could journey to the centre of the Earth, what would be the sensation
of gravity at various points on the way down, and at the centre?
www.newscientist.com
Did you ever dream of digging a hole so deep it came out the other side
of the Earth?
amos.indiana.edu