I don't really know but I think its a magnet
its solid and cool because the outside cools faster than the inside
Take a walk outside. Then you will be walking on the Earth's solid surface.
The crust
it is a solid because of the outside and the inside has a liquid.
A door is a common object that fits this description. When a door is closed, it appears as a solid barrier on the outside but allows entry to the inside. When the door is open, the inside becomes visible from the outside, blurring the distinction between the two spaces.
No, the inside of the moon is solid and cold.
Solid metal
Take a walk outside. Then you will be walking on the Earth's solid surface.
The order of layers from the outside to the inside of the Earth is the crust, the mantle, the outer core, and the inner core. The crust is the thin, solid outer layer where we live, followed by the mantle, which is composed of semi-solid rock that flows slowly. Beneath the mantle lies the outer core, a liquid layer made primarily of iron and nickel, and at the center is the inner core, a solid sphere also composed mainly of iron and nickel.
The four layers of the Earth from outside to inside are the crust, mantle, outer core, and inner core. The crust is the Earth's outer layer, followed by the mantle which is a thick layer of rock. The outer core is a liquid layer of iron and nickel, and the inner core is a solid sphere consisting mostly of iron.
A bubble because you have the inside and outside, it may not be solid but it may be solid information I dont know. Patrick Ward http://www.aquashield.us.com
The immense pressure inside Earth keeps the inner core solid even though it is well above its normal melting temperature.