Nate #34

‘‘Convection Currents’’ , Practical Activities (pg125)

1) Explain what causes convection currents
Convection Currents occur by hot air rising and cold air sinking. This is because hot air is lighter wheras cold air is completley opposite meaning it is heavier.

2) Use a diagram to clarify what a ‘hot’ current does.

3) Identify the direction of a ‘cold’ current.
A cold current spins in an anti-clockwise direction

Conclusion

The hypothesis had turned out to be correct for thst the hot dye had risen and the cool dye had fell. This had been proven right because hot air is known to rise and cold air is known to sink.

 ‘‘Colliding Plates’’, Practical Activities (pg133)

‘‘Plates that Separate’’, Practical Activities (pg132)

1) Explain how this activity relates to the spreading at the mid-ocean ridges. 
This activity relates to the spreading at the mid-ocean ridges which refers to plates that separate. By the forming of an ocean ridge it requires plates that separate therefore they relate with each other. Plates are known to move extremely fast and generally a weakened fault line may form, causing huge valleys to for and magma fills it. The magma then cools and solidifies especially when it hits water.

2) Identify what in your model represents each of the following
a. Ocean Floor or plate – A4 paper
b. The water – The two desks
c. The lava flow – various layers that had been coloured
d. Gravity – the force of pulling.
e. mid-ocean ridge – glued division in the middle
f. The magnetic strips found in rocks parallel to the mid-ocean ridges - parallel to the lines my group had drawn

3) Describe what you noticed about the height of the paper as it emerged from the gap compared to the paper further out.
It had seemed to of rose higher to a new height.

4) Identify which of the strips you coloured would be the ‘oldest’ rock and which the ‘younger’ rock
The strip coloured yellow would be the oldest for that it was the furthest strip away from the central division line and the youngest rock would be the red strip for that it was the closest to the central division line.

5) Identify which of these strips would be the first to be ‘swallowed’ by an ocean trench.
The first strip that would be swallowed would be the yellow strip which is the oldest rock, would fall into the trench first.

Conclusion
The hypothesis written had been correct as research shows that the plates that separate usually occur due to natural disasters for instance earthquakes and volcanic eruptions.