1. atmosphere
2. crust
3. mantle
4. outer core
5. inner core

"Just wanted to share a fact that I found interesting. Since no one has ever gone deep enough in the Earth's core to find out what it's made off, we know what it is made of by analysing meteorites, which have been created at about the same time at the Earth."

Evy smiled.

(ooc: no, wait, I'm confused with this question)

"I'm not sure but... if we consider the first 5 to compose the core & crust, then: Exosphere, Termosphere, Mesosphere, Stratosphere and Troposphere... but those are 5 too."

Nope, not what I'm after...

Clues:
The Atmosphere
The Hy_ _ _ _ _ _ _ _ _
The Li_ _ _ _ _ _ _ _ _
The M_ _ _ _ _
The C_ _ _

5 points to Evy for the interesting fact!

"Then it's hydrosphere, lithosphere, mantle and core, right?"

The second is Hydrosphere I suppose?

Raises hand. "Lithosphere, Mantle, core, and Hydrosphere...?"

The Hydrosphere
The Lithosphere
The Mantle
The Core

Evy's on a roll! Another 4 points!

The earth consists of five parts: the first, the atmosphere, is gaseous; the second, the hydrosphere, is liquid; the third, fourth, and fifth, the lithosphere, mantle, and core, are largely solid.

The atmosphere is the gaseous envelope that surrounds the solid body of the planet. Although it has a thickness of more than 1100 km (more than 700 mi), about half its mass is concentrated in the lower 5.6 km (3.5 mi). The lithosphere, consisting mainly of the cold, rigid, rocky crust of the earth, extends to depths of 100 km (60 mi). The hydrosphere is the layer of water that, in the form of the oceans, covers approximately 70.8 percent of the surface of the earth. The hydrosphere consists chiefly of the oceans, but technically includes all water surfaces in the world, including inland seas, lakes, rivers, and underground waters. The mantle and core are the heavy interior of the earth, making up most of the earth’s mass.

Does anyone know the total surface area of the earth, in sq km?

*Jessica scribbles down notes as they are said*

Meghan writes down everything said and wishes she knew this answer.

"Thanks professor. I think it's 510,066,000 sq km but I'm not quite sure..."

*raise hand* The Equatorial diameter is 12,756.28 km, and the Equatorial Circumference is 40,075 km

Yeah its a fair tricky one, but big points if you get it!

*shakes head* Oh, no, sorry, you were asking about the surfice, not the mass. It is 510,067,420 km2

Well smack me down with a broom, thats 3 in a row! So with the points and a special bonus you recieve 10 points!

Another tricky one, how about the volume, in cubic km?

"Thanks for the points, professor! Oh my god that question is hard!..Is it 1.08 x 10^12 km^3? I think I read that somewhere, though I'm not sure if the source is reliable..."

"Um is it... 1.0832×1012 cubic km?" Meghan looks at the Professor with an unsure face.

Yep, you both get 5 points for that effort!

Radiometric dating has enabled scientists to arrive at an estimate of 4.65 billion years for the age of the earth.

The magnetic poles of the earth do not correspond with the geographic poles of its axis. The north magnetic pole is presently located off the western coast of Bathurst Island, in the Canadian Northwest Territories. The south magnetic pole is presently situated at the edge of the Antarctic continent in Adélie Coast about 1930 km (about 1200 mi) northeast of Little America. The very interesting thing is that these can change and move around!

Probably the most amazing thing about eart however, is that it is able to maintain life. Due to the oxygen rich atmosphere, the abundance of water and many other chemicals and compounds, allow the earth to be a perfect place to harbour life. As of yet this is the only planet that is known to do so. What are your thoughts? Do you think there are other planets out there that support life?

Mithos raises his hand "Of course, i mean it might not be humans but it could be anything out there! Im not saying its a fact but my opinion is that there is life in other planets.."

*Jessica thinks for a minute then raises her hand* I think that there is other planets with life out there somewhere. i mean, we have 1 planet in this galaxy with life on it, and there is proof that Mars could've supported life forms. so, who's to say that other galaxys dont have life. and there are so many videos with so called "U.F.O.s" i think that there's defidently life out there somewhere. *she smiled and put her hand down*

"Well as far as we know, none of the other planets have oxygen which all life needs, alogn with food and whater. Also the temprture is an issue too. "Lita offered.

Bailey raised her hand to share her thoughts. "I do think that there is life on other planets. There is so much area out in space, I find it hard to believe that not one other form of life, no matter how small, somewhere on a distant planet."

Meghan thinks. "I think they may be life on other planets. We have never explored many plnets so you never know. The universe never ends and we can't be the only living beings in this universe."

"Well I do think for sure that there are other planets out there that support life. Actually, I'm quite surprise that we have not yet discovered one of these planets. Perhaps in the future, with a more advanced technology, man will be able to go further and reach planets that support life. However, I don't think we will find aliens with a body similar to ours. It will most probably be very small cells, completely abnormal-looking creatures (at least to us) because of course they won't live in the exact same conditions as we do, superior beings or maybe we won't even be able to detect these extraterrestrials. We have a certain conception of what a living being shall look like, but what if we can't see them? I mean, nothing says that we'll be able to perceive these 'aliens', if you understand what I mean. We have not discovered everything about Universe,a nd it continues to surprise us..."

Evy scribbled down something in her notebook.