Brain Drain (FM and PT)

See in geography book

Revision Guide is located in Easynotecards

Success Criteria (5/12/11) Physical Features and Humans What's a ocean trench?

Success Criteria (5/12/11)

• I can link physical features and human activities
• I can locate and explain the formation of ocean trenches
• I can record what i did today effectively 

Plate Boundaries:A Summary

View geography (Plate Tectonics)

Oceanic Continental Plates summary

Oceanic	Continental
Density (3.0) Heavier	Density (2.6) Lighter
30-70 km thick	6-10 km thick
<200 million years old (younger)	>1,500 million years old (older)
Basalt,silicon,magnesium,oxygen	Aluminum,granite,silicon and oxygen

Destructive,Constructive and Conservative Margins

What are the difference between plates made of oceanic and continental crust?

A continental plate is much lighter in density. It is thicker and therefore "floats" higher on the mantle and is above the ocean level. The oceanic plates are denser, less felsic, and are thin and are generally covered by the ocean. Continental plates are generally older. Oceanic plates tend to get subducted beneath other plates. During the process of subduction, lighter material is sometimes forced up with magma that may add substance to the continental plate.

What are the difference between destructive and constructive plate margin?

At a constructive (divergent) plate boundary, new crust is being created to infill the gaps caused by spreading plates. At a destructive (subduction-convergent) plate boundary, old, dense oceanic crust is diving into, and becoming part of the mantle

How is a conservative margin different from those two?

A conservative margin does not create nor destroy. It only moves side by side in the same or opposite direction. Unlike constructive and destructive margins, no volcanic activity occurs here. Although, earthquakes do happen when pressure builds up on the plates.

Plate Boundaries: Notes

Plate Boundaries

KEY words: lithosphere,convergent,(destructive)divergent (constructive),conservative

-Boundaries don’t move in the same direction

-Plates are divided into the continents they resides in

-North American plate seems to be the biggest

-Juan De Fuca plate is the smallest

-Some plates are completely oceanic, some are a mix of oceanic and continental plates

-Some plates have trenches

-some plates have ridges

Red: Where plates meet

What are PLATE BOUNDARIES?

Found at the edge of lithosphere

where tectonic activity takes places

3 types of plates

A Vlog On The Continental Drift Theory

Content:

Hello today I’m going to talk about one of the most extraordinary theory that seem to have shattered the geographic community, the continental drift theory. Proposed by Alfred Wegener, the theory stated that the earth was once a super continent called Pangaea and then over time the continents seemed to have drifted apart to their current places due to millions of years of tectonic activity. At first the geographic community disagreed with the theory but then convincing evidence was dug up by Alfred. He found out the dinosaur Mossasaurs was found out on opposite sites of the world, also he discovered that similar animal and plant species were found on different sides of the world. If that evidence was not convincing enough, he discovered that the continents could fit together like a big jigsaw. Plus, there was more evidence with similar chalk samples found from mountains in the UK and France. Lastly, glacial has been found on countries like Africa and this proves that Africa was always not near the position where it was supposed to be and it drifted from somewhere near the colder regions. Sadly, this still was not enough to convince the community in Alfred’s time but now it has become a generally accepted theory in the geographic community.

Alfred's Facebook Page

Layers Of The Earth ( Note Form)

• Unfortunately, I cannot post my mind map here, so this is the note form
• 
  
• 
  
• Layers Of The Earth
• The Core
• Thickness: 2900km
• Made up of two layers: Inner and Outer
• Dense ball of iron and nickel
• Rotation of inner core round the outer core causes magnetism.
• 1/3 of earth's mass, 1/6 of earth's volume
• Convection currents happens here when current is heated by core and rises to the crust, when it rises to the crust, it cools and falls, then the cycle repeats
• The Crust
• Two types of crust: Continental/Oceanic
• Contains substances and minerals within
• 1/250 of the earth's mass
• Has tectonic plates within the crust
• If tectonic plates touch, earthquakes happen
• Made up of rock and loose material
• The Mantle
• Has two layers inner and outer
• Function is to separate them
• About 2/3 earth's mass, 5/6 of the earth's volume
• Distance: 2900 km thick  Average Temp: 3000'C
• Outer Core
• Temp:4000-5000 C
• contains iron, nickel and 10% sulphur and oxygen
• The inner core rotation around it causes the earth's magnetism.
• 2890km-5150km from surface
• Outer Mantle
• Thinner than inner mantle
• Thickness: 10km-300km
• Temp: 1400-3000
• Made up of tough liquid rock with different densities ( made up of iron/magnesium silicates)
• Inner Core
• Distance from surface is 5150km-6370km
• About 5000-6000 C 
• Consists of iron, nickel and a few other elements
• High pressures makes it a solid
• Rotation round the outer core causes the earth's magnetism 
• Inner Mantle
• Thickness is 300km-2890km
• Average temp of 3000
• Made up of solid rock due to high pressure and temp.
• contains sulphides and oxides of silicon and magnesium

Reflections-Layers Of The Earth

For our first mini assignment, we were asked to do a presentation on why the earth is similar to a bowl of trifle. I was paired up with Douglas and we decided to do a powerpoint presentation. We found information off the internet and put together a powerpoint and showed it to the class, explaining each slide along the way. The response was fairly good, saying that the powerpoint was informative with diagrams and pictures to back it up.

In my opinion, I think we did a fairly good job at presenting our information, although i think we could have used voiceovers or added movies to the presentation would have spiced up the presentation even more. This way we could attract the viewer's attentions and enable them to recall the info with ease. Also Miss Claire suggested that different colors  in slides or words should be used to reinforce what the presentation is about as colors evoke thought and enables better memory retention.

In Ming Yong's and Fadley's presentation, I liked the movie that was also put into the slide. It helped recapped what was in the presentation such as the the components of the layers. Although info was slightly lacking, it was a excellently well put presentation and I would defiantly use the movie idea for my next presentation.

In Praveen and Dimas's presentation, I liked the voiceover parts of the iMovie as it felt like it was some sort of documentary on the National Geographic Channel. Although, diagrams and pictures were not very plentiful in the presentation, it was filled with a lot of info on the layers on the earth. If I were to improve my presentation, I would use the voiceover concept plus extracting the various bits of info from their presentation.

I enjoyed this mini assignment as it showed us the creativity of other people and how we can learn from them to make ours better. Also, it has taught us teamwork and to appreciate what other have done.

Ng Wi Kiat

The Earth And Trifle: A presentation