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 Science & Mathematics ➔ Astronomy & Space
lmfao I wasn't paying attention. I know it's ABCD
2007-12-20 08:43:01 · update #1
ok. so the statement about seasons is the ONE reason that has NOTHING to do with earth sustaining life
all the rest are valid options
I'd give the teacher hell for this asking this question.
hmmmmmmm..............................
jupiter has mag fields too but there is not life..........
mars does have an atmosphere but its only like 1/8th as thick as earth's......................
maybe the answer is the obvious B.....................
A. because some other planets DO have atmospheres.
Cd. because some other planets DO have mag fields
Dc. seasons has nothing to do with it
no other planet has high levels of oxygen
2007-12-20 08:41:57 · answer #1 · answered by Mercury 2010 7 · 1⤊ 0⤋
Earths mass is the answer. It is because of earths mass the earth has an atmosphere, that hasn´t been blown away by the solarwind, oceans and geological activity. Also earths distance to the sun is quite important.
Of the answers you have to choose from A is the most correct one even though it is a function of earths mass. Earths atmosphere has oxygen because of life and not the other way around. So B is wrong.
D is marginally important. If earth weren´t tilting life would just adapt to a non tilting planet.
C is completely false. Ultraviolet rays, as all electromagentic radiation, are completely unaffected by magnetic fields. It is earths atmosphere that filters out UV.
2007-12-20 10:35:40 · answer #2 · answered by DrAnders_pHd 6 · 0⤊ 0⤋
All these reasons are important. However the main reason we are here is due to one thing: Stability.
The earth has the biosphere that we all know and love because the earth has had a stable cosmic environment for billions of years.
Think about how extraordinary it is: The Earth is about 4 billion years old. In all that time it has never met a cosmic disaster bad enough to destroy it or to sterilise it's surface.
Even though the Earth has been around the galaxy about 20 times since it formed, it has never been disrupted by a rogue star or planet. It has never been sterilised by a nearby supernova. The sun has shone steadily all this time. No major disruptions to the orbits of the major planets of our solar system has occurred. Plate techtonics have continually recycled the Earth's atmosphere during this time.
It is probable that many planets are formed in our galaxy alone. It is also highly probable that very few if any have enjoyed the remarkable longevity of stability that the Earth has.
2007-12-20 09:01:49 · answer #3 · answered by Quadrillian 7 · 0⤊ 0⤋
You have labeled these out of order A B D C?
The atmosphere on other worlds (Venus and mars) is not blown away by solar winds is it? no... in Venuses case, a bit less atmosphere would be a good thing wouldn't it?
Ok, Oxygen is important... I like B
D or "The third Answer" seasons are very very important to most life systems here on earth AND seasons are caused by the tilt... I like "the third answer" which you call D
C or "The fourth answer" is incorrect. The magnetic lines of force from the earth filter out solar radiation (Aurora borialis) NOT ultraviolet light (ozone layer) so .. um NO GO on answer for which you call C.
2007-12-20 08:48:08 · answer #4 · answered by erikfaraway 3 · 0⤊ 0⤋
Earth's magnetic field does nothing to filter out ultraviolet rays (that is the Ozone layer, the magnetic field deflects cosmic rays)
Seasons are not necessary to life, although the "as we know it" qualifier is somewhat ambiguous.
B is extremely ambiguous, and again dependent on the precise interpretation of "as we know it"
A seems the most promising answer: without a magnetic field, Earth's atmosphere (or at least its water) would be slowly lost to space. It was essentially this fate which overtook Mars several billion years ago.
2007-12-20 09:25:33 · answer #5 · answered by Hermoderus 4 · 0⤊ 0⤋
the earth sits in a tiny orbit around the sun which for some reason allows the nature of our planet to thrive and because of a freak happening in quantum physics which allows things such as life, nature, atmosphere's, oceans birds,mamals,fish, apes and monkeys to evolve.
every considered a fact of evolution against god, i was told about a site which explains both
evolution being 15 billion years
god created the earth 6000 years ago or there abouts
the sites called http://drdino.com/downloads.php
only download one video at a time and make sure you have a lot of spare time
2007-12-20 08:47:42 · answer #6 · answered by Anonymous · 0⤊ 2⤋
None of these.Earth is at correct distance from Sun ina habitable zone where temperature is suitable for life.InMercury,venus life as we know it,can not sustain
2007-12-20 08:41:15 · answer #7 · answered by Chandramohan P.R 7 · 0⤊ 1⤋
One report says that without the Moon, life wouldn't have arose. I'll go with A.
2007-12-20 11:33:29 · answer #8 · answered by Thomas E 7 · 0⤊ 0⤋
i would say c. just because i dont think a is right. and for b, not all life needs oxygen. and for d, not all organisms are dependant on the seasons.
2007-12-20 08:39:25 · answer #9 · answered by Anonymous · 0⤊ 0⤋
It has water. Any planet with water, is a potential carrier of primitive life.
2007-12-20 13:06:39 · answer #10 · answered by Anonymous · 0⤊ 0⤋