Isostatic Movement?!

-blondie-

Anyone know what it is? Aparently its mento be coming up in the geography paper on Monday and we haven't done a thing on it in class!

Heeeeelp!::eek:

-blondie-

-blondie- wrote:

Anyone know what it is? Aparently its mento be coming up in the geography paper on Monday and we haven't done a thing on it in class!

Heeeeelp!::eek:

[edited so that it's super legible, even to mice.]

Why oh why did you use Arial Narrow & a Deep Sky Blue colour so that no-one can read what you wrote?

As for the title, google is your friend?

Corruptedmorals

It came up on a sample paper, and people are scaring themselves. It's in your book. You can't predict it ffs, there's only one paper that's absolutely safe to go by. It's basically rocks in relation to sea level, changing rock/sea levels. Examples are fjords and rios.

-blondie-

Right sorry! Better?!

Yeah I know, I searched Google and didn't understand a word of it.

Something about rivers....? Basically I'm hoping not to have to do that question I guess...?

mathew

-blondie- wrote:

Aparently its mento be coming up in the geography paper on Monday

Its someones prediction. By no means something to get stressed over. Theres loads of choice, so if you dont know it, do another question.

To answer your question, its the rising up of the continents do to the melting of glaciers. Basicly, when they melted there was less weight pusing down on the continent so it uplifted.

You'd be doing well to get a 20marker or more out of it tho if you've never covered it. Have a look in the book. You may be able to pick out some more points

melsman

Corruptedmorals wrote:

It came up on a sample paper, and people are scaring themselves. It's in your book. You can't predict it ffs, there's only one paper that's absolutely safe to go by. It's basically rocks in relation to sea level, changing rock/sea levels. Examples are fjords and rios.

no fjords and rias are examples of eustacy (features of submergence) isostacy is to do with the uplift of the land (features of emergence) such as entrenched and incised meanders and knick points

iggy-7

isostasy is the name given to the change in relative land-sea level. This happens in ireland after the glaciers melted at the end of the ice age. Downward pressure on the land was reduced so that the land rose upwards. The effect of the isotatic rise of the land is obvious aong rivers in the east, norteast and northwest of ireland

Where land 'rose' relative sea level fell, rivers gotnew energy for vertical erosion in their middle to lower courses. The river increased its speed so it began to cut into its bed by hydraulic action. This process is known as rejuvenation

This point of change from te old to the new profile is marked by 'step' referred to as a knickpoint

Draw a digram of knickpoint

Knickpoints form by renewed hydraulic action as the force of the falling water erodes vertically into the river bed. Knickpoints are usually marked by a waterfall or set of rapids. A good example is Kathleen's Falls on River Erne at Ballshannon.

On a meandering river, rejuvenation renewed vertical erosion by corrasion. As the river debris rolls along, it abrades the river bed making it deeper. As a result, the meanders become more incised (cut downwards) into the valley floor. Example:River Liffey, near Lucan, Co. Dublin

Draw a digram of a incised meanders

The river erodes vertically through the sediments of clay and silt that have been deposited on its floodplan. A new, narrower floodplain is formed at a lower evel then before. During floods, the river outflows and deposits sediment on the floodplain on either side. As a result of repeated changes in base level, a series of paired terraces may form along both sides of of the river. Example River Nore near Thomastown, Co Kilkenny

draw diagram of paired terraces

good luck;)

-blondie-

you are a comlete legend!

thanks a mil- gret help!