5 earth science questions. multiple chhoice[?

Question

1: Every few hundred thousand years, what mysterious phenomenon occurs on earth?
a. an ice age---what I think
b. extinction of species
c. planet-wide volcanic eruptions
d. the reversal of the magnetic poles

2: The plates of the earth moving on the molten rock below caused ___________.
a. continental drift
b. larger oceans
c. tornadoes and hurricanes
d. none of the above--what i think

3: The variation in the length of day and night is caused by ____________.
a. the varying temperature of the sun
b. the gravity of the moon
c. the tilt of the earth's axis---what i think
d. the measure of the earth's diameter

4: ________ surround the planet because high pressure air always moves toward low pressure air.
a. winds-- i think
b. clouds
c. ocean waves
d. snow-capped mountains

5: It has happened before. It will happen again. What is it?
a. the shift in the content of earth's atmosphere to all carbon dioxide
b. the ice age--- what i think
c. the reversal of earth's orbit
d. none of the above

Answer 1

1. While "A" would seem like a great answer for number one, I would lean towards "D". True Ice Ages are more spread out than a few hundred thousand years (try only four major ice ages in the last 2.5 billion years), while geomagnetic reversals are more common, with an average range of a few thousand years between reversals. Also, throw in that compared to our knowledge of ice ages, geomagnetic reversals are still a new concept and we don't know a lot about them...hence they would seem to be a more mysterious phenomenon. Now, glacial periods on the other hand (which is what I suspect your homework is talking about) is often associated with ice ages. These repeat about every 50-100 thousand years, but that would be too low if the question is asking every few hundred thousand years. If this is what your question is referring to, than I would understand putting "A" as an answer.

2. I think "A" is what your teacher is looking for, though you could look at both "A" and "B" since both are a result of plate movements.

3.You are right, it is "C".

4."A" is correct.

5."B" would be correct.

And Geomatic7000, I'd be interested in hearing why you stated that Continental Drift is a debunked theory. Isn't the main idea of that theory the basis behind the Theory of Plate Tectonics? Continental Drift played a important role in the development of later theories. It might be that this person's teacher is trying to teach the importance of that. I happen to teach this same stuff. I try to teach the importance of the theory at that time, why Wegener was rejected by many scientists, and how the later addition of concepts like sea-floor spreading helped lead to the theory of plate tectonics. We also discuss what evidence Wegener used to develop his theory. If you think I'm teaching stuff that shouldn't be taught because you feel that schools teach crap, please e-mail me and explain why you that this "debunked theory" of Continental Drift crap that shouldn't be brought up at all. I'd like to hear. I also take offense to the idea that schools teach crap. There are some teachers that make mistakes (or even worse, need to be let go), but to hold that against all teachers and the schools they work at is a bit unkind. Was every teacher that you had a bad teacher?

Answer 2

1)all of them, but the extinction of species happen more than the rest. there is porff that the earths magnetic polls can change, the polls in magnetic rock go all gig saw like, and there are maps of the earths magnetic feild and how it is changeing as we speak. and when that change happens the earths mantle expaneds from the presure of the magma geting churned up, and the vocanos go boom, then the ash cloud covers the sun and plunges us in to an ice-age.
2)all but D, the atlantic rige seperates at about the same rate as ur finger nails, making the ocean that much bigger, and the bigger the oceans the bigger the storms can get cause theres that much more space for it to grow.
3)C, the resone why whinter day are so surt is because the earths axis points away from the sun putting most of the northern hemasphere's mass on the dark side.
4)all of them, clouds form when the wind makes the presure just right, most waves are formed by the wind, and most snow on mountains come from the wind picking up mositure frome lakes and other bodys of water, but if u relly wanted to be right u should have put the JET STRIME on there.
5) B, C has never heppened and will never happed. A, well i don't think we'll let it get that far, if the shiff dose happen then it will take many years for it to happen

Answer 3

The key to MC questions is to eliminate as many as you can.

1) You are right on this one. You could also say D but your best bet is A.

2) The answer might be A, but it shouldn't be continental drift, as it is a debunked theory. But considering schools teach crap, it might be the right answer in this case.

3) You're right on this one. Its an easy one.

4) You're right on this one.

5) You're right on this one.

Make sure to go back to your text and your notes and learn why you are right (or wrong) so you can learn from it. That's why I hate multiple choice. No body learns from it.

Answer 4

i'm uncertain neither related to the respond, yet once you're saying C, you may say D besides. the fabric flow under the Earth mantle - different than you think approximately the Earth mantel is going deeper than the lithosphere. for this reason the plates that are "swimming" on that liquid (magma) are displaced. while 2 plates withdraw from one yet another, magma comes up and fills the void. it quite is no longer the magma that pushes the plates. while 2 plates are pushed at the same time, one is pushed under the different and could soften. i might say A by potential of extending the Earth mantel to the magma under the lithosphere.

Answer 5

just go with what you think, and learn from your mistakes. that will help u more than me telling u you're wrong, not that i have a clue what the answers are ;)

Answer 6

1: A
2: A
3: C
4: A
5: B

Answer 7

1.A
2.A
3.B
4.B
5.A&/OR B BUT I WOULD SAY B.