Science & Mathematics - 20 December 2007

What is one reason that Earth is able to sustain life, as we know it?

A. The atmosphere is not blown away by solar winds, as on other planets
B. Earth's air, oceans, and soil have the right combination of oxygen
D. The Earth tilts on its axis as it rotates around the sun, causing seasons
C. The magnetic field of the Earth filters out harmful ultraviolet rays

2007-12-20 08:33:33 · 11 answers · asked by Anonymous in Astronomy & Space

They usually last a week.

2007-12-20 08:32:48 · 7 answers · asked by Nickish 1 in Geography

Every day i see **** in my back yard, They are beautiful and make me want to hold them but they will go away as soon as my hands go near. Why is that?

2007-12-20 08:32:39 · 11 answers · asked by Anonymous in Zoology

Serious answers only, please. This is schoolwork.

2007-12-20 08:30:45 · 12 answers · asked by Abby 5 in Earth Sciences & Geology

ever have this done and what are the results ..my knee bothers me when i run so i quit running he said therapy wont help is this true???dont want to get operated on but willit get worse ..appreciate any advise thank you

2007-12-20 08:30:15 · 3 answers · asked by peetex1 3 in Medicine

http://tinypic.com/view.php?pic=8anw01l&s=1

2007-12-20 08:27:42 · 5 answers · asked by Anonymous in Mathematics

ok, so i had a test today and me and my friends are debating the answer. The question is: A peice of metal is resting on top of a floating peice of wood in a tub of water. If the metal is removed from the peice of wood, what happens to the water level of the tub?

It stays the same?
It goes down?
or You cant tell from the info given?

2007-12-20 08:26:24 · 4 answers · asked by Patricia M 1 in Physics

I need to find an easy read one. that is read in millibars please. i tried livesearch. PLEASE HELP

2007-12-20 08:25:37 · 4 answers · asked by Emma :]] 2 in Weather

2007-12-20 08:24:35 · 4 answers · asked by fast and furious 1 in Chemistry

I've heard a lot about this kind of thing, but I haven't been able to find anything that could tell me how to do it.

Oh, and none of these closed-minded idiots going "No u cant see ur aura, you crazy git". I want proper answers, and if you don't think people can do something, tell me why not.

2007-12-20 08:23:04 · 13 answers · asked by Anonymous in Paranormal Phenomena

Finish the sentence please.

2007-12-20 08:22:46 · 29 answers · asked by Anonymous in Weather

2007-12-20 08:22:22 · 4 answers · asked by Omar K 1 in Chemistry

my ex died in july and i often go to the cemetery and talk to him. i asked him to give me a sign that he was still with me..(spiritualy) and watching over me.
about 4 days later i had a dream about him and everyting was SO real. but it ended kinda bad. see he "came back" in my dream then at the end he died again. WTF??? what is he trying to tell me? or whas it jsut a coincidence?

2007-12-20 08:21:30 · 24 answers · asked by Anonymous in Paranormal Phenomena

2007-12-20 08:21:04 · 3 answers · asked by Anonymous in Astronomy & Space

For any process to happen, in Nature, a number of alternatives are available, but the process is complete and stable at the least energy state and that is the best and unique alternative. If a glass of water is poured on the road, nobody has to calculate in which direction it has to flow, how much to be absorbed by the surface, how much to evaporate, how long to flow and where to accumulate etc. If somebody calculates these factors with the available data, it will still be nearest approximation. But Nature makes no mistakes. It takes all possible factors, even those not known to man, into account. The result is unique that cannot happen by any other available alternative. Any comments?

2007-12-20 08:19:33 · 2 answers · asked by Gee Waman 6 in Physics

2007-12-20 08:19:00 · 6 answers · asked by Omar K 1 in Chemistry

do tell!!

2007-12-20 08:18:30 · 13 answers · asked by bamboo 3 in Paranormal Phenomena

I am always seeing floating objects (ghosts) out the side of my eye. I am sane and not taking any drugs. However I am constantly noticing unexplained movements around my place of employment.

Have you ever experience this?

2007-12-20 08:18:07 · 20 answers · asked by Anonymous in Parapsychology

Any enviroment changes? life? us?

2007-12-20 08:17:13 · 12 answers · asked by Anonymous in Astronomy & Space

i need to know this for science.
Thanks alot!!!!!!!!!!!!

2007-12-20 08:16:42 · 7 answers · asked by Lee 2 in Botany

I am trying to get the correct equation between KMnO4 and H2O2, and the equation for KMnO4 and Fe2+. The equation takes place in an acidic solution.

2007-12-20 08:15:35 · 2 answers · asked by Anonymous in Chemistry

I'm looking for the places in the world where giant trees can be found - California, New Zealand, Tasmania - are there any others? Thanks!

2007-12-20 08:14:16 · 4 answers · asked by marian w 1 in Botany

2007-12-20 08:13:39 · 6 answers · asked by kNicole 1 in Zoology

I would like to know how many of you out there have experienced anything paranormal. Only truthful answers please..... tell me some background..

2007-12-20 08:11:56 · 24 answers · asked by erin_foss8191@sbcglobal.net 3 in Paranormal Phenomena

Hey, I need some help with this question, so any information would be great!

A 5.25-kg piece of wood (specific gravity= 0.5) floats on water (density= 1000 kg/m^3). A mass of lead (density=11,300 kg/m^3) is hung from the bottom of the wood block. What minimum mass of lead will cause the lead/wood combination to sink?

I found the density of wood to be 500 kg/m^3.
I know that there are two buoyancies going up and two weights going down.
I also know that I should use this equation:
Buoyancy= (density)(Volume)(gravity). But the thing is, there's no information that would be able to give me a volume, so that's where I'm stuck.

So please help if you can because it'll be much appreciated! Thanks.

2007-12-20 08:09:34 · 4 answers · asked by Anon. 2 in Physics

2007-12-20 08:09:04 · 4 answers · asked by llknights_14 2 in Botany

I have noticed on y/a that there are some individuals whose atoms appear to be packed more densely. In fact, if their density becomes much more, it might open up a black hole or something. So, please, my friends, keep your atoms in line, okay?

2007-12-20 08:08:32 · 11 answers · asked by Anonymous in Physics

2007-12-20 08:08:00 · 9 answers · asked by Anonymous in Physics

2007-12-20 08:05:18 · 27 answers · asked by Anonymous in Zoology

2007-12-20 08:03:48 · 6 answers · asked by Anonymous in Earth Sciences & Geology