Writing Journal 5!

Jamie is holding the jar of oil and water. The water is on the bottom and the oil is on the top. The red food colouring has mixed with the water.

Equipment:
glass jar and lid
water
cooking oil
red food colouring
6 grains of rice or raisins

Method
Half fill the jar with the water.
Add the oil until 3/4 full.
Add a few drops of food colouring.
Drop in the raisins or rice.
Put on the lid tightly! Slowly turn the jar upside down and observe what happens.

Observation
(What we saw happen)
When we shook the jar, the oil and water never mixed together. The oil always went to the top and the water stayed on the bottom.

But why?

This is because the water is more dense than the oil.
The raisins and rice were there to show us the oil moving through the water.

The jar has been turned upside down. The oil slowly moved through the water and rose up to the top again!

Magma is less dense than the rock around it in the volcanoes vents.
Therefore the magma rises up through the rock and comes out of the openings in the volcano.
This experiment showed how the magma (the oil) would always go above the rock (the water) because the magma was less dense than the rock.

Written by Room 15