please correct me if I'm wrong?

Question

Sea level rises during periods of intense glaciation, when glaciers are numerous and large. TRUE?

Glacial ice in a receding glacier moves back up its valley.TRUE?

From upper surface to base, all parts of a glacier move at the same velocity, as a rigid block. FLASE?

Most glaciers in the United States and Canada are of the valley type.TRUE?

A large trunk glacier erodes downward more rapidly than smaller tributary glaciers.TRUE?

An advancing glacier has a positive budget of snow and ice.TRUE?

Radioactive wastes are now dumped in the ocean.FALSE?

The capillary fringe is usually thicker in fine-grained sediments like siltstone and thicker in coarse-grained sediments like sandstone and conglomerate. I HAVE NO IDEA, TRUE OR FALSE???

SORRY, I HAD TOO MANY QUESTIONS

-THANKYOU!

Answer 1

#1 True- Glaciers originate on land, & form from accumulated snow, when more snow falls in winter than melts in summer. When large pieces of the glacier break off (called calving) & fall into the sea, creating icebergs, this causes the sealevel to rise.

#2 False- When the glacier retreats, the ice actually melts, thus only appearing to have moved back up the valley. The glacier retreats when it loses ice faster than it gains ice, so the glacier is melting.

#3 False- The surface of a glacier behaves differently than the ice below. The top ice piggybacks a ride on the flowing ice below it. This process is called basal slip.

#4 True- Canada used to contain continental glaciers, but the only existing continental glaciers now, are the ice sheets of Greenland & Antarctica.

#5 True- b/c of the extreme increased weight

#6 True- The glacier advances when more ice accumulates at the glacier head, than melts at the glacier foot. This is called a positive budget.

#7 False- Radioactive wastes used to be dumped in the oceans in large sealed barrels, but now there is a ban on this (thanks to Greenpeace & other organizations).

#8 http://www.earthdrx.org/poresizegwflow.html

Good Luck on you HW assignment. I answered b/c I can see that you attempted it yourself first, instead of just expecting others to do it for you (also, b/c I love Geology). I hope this was helpful.

Answer 2

1. FALSE - During periods of glaciation, all the water that is tied up in the glacier USED to be in the ocean, but now is not. So sea level is actually lower.

2. FALSE - The ice does not move back up the valley, it is still moving downward as always. It's just that it's rate of melting is faster than it's rate of advance, so the net result is that the position of the glacier's edge moves up the valley.

3. FALSE - You are correct... different parts of the glacier move at different speeds.

4. TRUE - (I am 90% sure of this one... I don't remember how much of Canada is covered with continental glaciation. Just wanted to be up front about that. I'm 100% sure about 1,2 and 3).

5. Don't know.

6. TRUE - A glacier cannot advance without net gain of material.

7. TRUE - Unfortunately.

8. You said "thicker" in both parts of the question, but even if you hadn't I'm not sure what the answer is.

Sorry I'm not 100% sure about every one of these, but I knew enough of them that I figured it was worth helping you out.

Answer 3

Think about it there is only so much water on the earth; when you freeze the planet then the water that falls down on the earth as rain freezes. If the rain if freezing before it ends up in the ocean then the ocean levels are going to drop and the place where most of the freezing is going on, the glaciers are going to see more ice and snow on them and they will grow. For your first question is False.

Now think about where glaciers form. Most form in the mountains because it is cooler up there, but some form in valleys because it is where the water can collect and freeze. That can only happen around the Artic. So any glaciers near the equator have to be very high up like on the slopes of Kilimanjaro in Africa.

Now look at a map and see where the highest peaks are in the US, that’s easy places like Pike’s Peak in Texas and Mt. Rainer, the tallest mountain in the US. Since Mt. Rainer is in the far northern US and high it is able to support a glacier. It is one of the few US Mountains that can support glaciers year round. The rest of the Rocky Mountains aren’t high enough, but that same range runs down to Antarctica and in Peru it is high enough to support glaciers. So where in the world will there be glaciers in valleys? Clearly Antarctica, which is mostly glacier, but there aren’t a lot of land areas of valleys near Antarctica; the nearest bit of land area the mountainous Straights of Magellan. Okay, so maybe we had better look north to what nations? Well the only nations that own land inside the Artic Circle are the US (Alaska) Russia and Canada. Most of that land is cold and has ice on it constantly; another words it can be covered by glaciers. But, all of that land is flat, scoured so by past glacier action. Therefore the Canadian glaciers are in valleys.

Okay what does a glacier do, it doesn’t just sit there, the Earth is a dynamic planet and things tend to change. Glaciers move, what happens is when the ice and snow gets lower and lower to the ground the temperature increases, if it gets above the melting point of water then it melts and you have water. Put a huge mountain of ice on top of a thin film of water and it will flow downhill along with the water. So unless the glacier is in a valley it is going to be on a slope and so it will flow. As the melt rate increases then the flow rate increases. In Antarctica the Ice Ross Shelf was one of the world’s largest glaciers. It was flowing into the ocean until large parts of it broke off and the speed increased due to global warming. This was one of the big factors that told us global warming was a problem.

What is going on when that glacier flows down a hill? It has a very thin film of water because all that weight of it crushes it down to a small and tiny film. That means that most of the stones and rocks on the mountain stand up outside of this film where the flowing, rock hard ice, can reach it. The result is that these outcroppings are shorn off, which is how glaciers scour out an area. This great, but what is driving the glacier to perform this scouring action? Gravity has a good deal to say about it, but gravity is an odd force and not that strong. The weight of the ice of top of that glacier is very strong though, it concentrates all the mass, which increases the gravity effect on it which means it weighs more and so it pushes more ice downhill. To do that it has to have a lot of ice and snow pilled high on top of it. If it is a thin glacier then it doesn’t have much weight so it wont have much pressure pushing it downhill. So larger and heaver glaciers are moving faster. A tributary is a stream or glacier running into another larger one. If a tributary glacier is running into another then it can only move as fast as the larger glacier, or slower. If it tries to move faster the ice of the glacier gets in the way and slows it down.

If that doesn’t give you a clue to your questions then you have to go back and read it all over again and do your own homework.

Are radioactive wastes being dumped into the ocean? They can’t help to be done so, although hopefully no country is stupid enough to think that dumping nuclear waste at sea is a good idea. I know the US doesn’t think that.

In Washington there is a nuclear power plant that has been running since the Manhattan Project; the invention of the atomic bomb. This plant is where most of the material comes from that is used to make our nuclear weapons and it has been in operation for a very long time (since the mid 1940s of course). There are no good places to store nuclear waste in the US so a lot of waste is stored at that plant and has been there all this time. It was discovered, 40 years ago, that the waste was leaking. It was leaking entering the ground water and flowing into the Columbia River, which flows down stream to the ocean, supplying a lot of drinking water along the way.

The waste is still there, some of it is too dangerous to move and there still is no good place to store it and no one wants to transport it. The waste is still leaking so yes the US is letting some nuclear waste go out to sea, we can’t stop the process. We are looking for a better place to store the stuff, but we are talking about a place that has to hold the stuff for 1000’s of years and that is a major problem.

Capillary fringe can mean a lot, I am not sure what it means in geology. I think it means the tiny cracks that allow water to enter the rock. If so then the softer rock is going to have fewer cracks, the pressure and natural smoothing effect will cover those capillaries. So the harder rock will have more capillaries in it. But, then the harder rock is going to be harder for the water action to drill those capillary routes into the rock in the first place, so a harder rock is going to have fewer capillary routes into it. The finer grade of the sample means the smaller the bits that make it up. If the bits are smaller then there are more ways around them so more possible capillary routes. Another words rephrase this question and ask your teacher or ask a geologist.

I can't do all of your homework for you, and yes you had too many questions.

Answer 4

I think your last question is false all of your other questions are right

The capillary fringe may be very thin in coarse-grained sediments

Answer 5

no idea... i'm not doing social studies or science or whatever it is, it's the summer!!! i'm gonna be in school in a few weeks
:(