Yes, "Sozin's Comet" will be shown on Nick again.
it is Halley's comet and it was thought to be a bad omen in 1066
It marks the axis from Pole to Pole about which the planet revolves.
The Earth's surface can be shown through maps, satellite images, aerial photographs, and digital elevation models. These tools provide different perspectives and details of the Earth's surface features.
The wave shown is a shear wave, also known as an S-wave. This is the only wave type that can travel through the Earth's core because it does not propagate through liquids, like the outer core, where P-waves cannot travel.
Only the surface.
The north pole is usually shown at the top of a map of Earth.
A comet's tail points away from the sun. Sometimes the dust and gas separate, though, because they are driven by two different effects, radiation pressure and solar wind, respectively. Both point mostly away from the sun, but not always exactly. Photographs of Comet Hale-Bopp show this effect well, for example, the Astronomy Picture of the Day at the link shown. A comet in deepest cold space is generally thought of as a giant dirty snowball with the snow made of water ice, and frozen organic liquids, and the dirt of small rocks and dust which are the debris of explosions and collisions of different bodies in space. It is only when the comet approaches the sun and warms up that surface ice melts and vapourises carrying dust with it and forming a large cloud that we can see clearly. It is at this stage when the effects mentioned above act on the cloud and sweep it behind the comet relative to the sun to form a tail or tails, and because there is no atmospheric air in space the tail always points away from the sun even when the comet is travelling away from it.
Yes, someone who works for Google does filter the pictures shown on maps in Google Earth. Otherwise, there may be something wrong with the picture if not.
Ammonium chloride can undergo sublimation, meaning it can change from a solid directly to a gas without passing through a liquid state. Sodium chloride does not exhibit sublimation behavior.
Earth symbolizes physical sensation. It is also shown in comparison with fire, Earth's steady movement vs. fire's constant motion.
Unexcavated simply means "untouched earth" or "natural earth."