Bees and wasps are insects which use a sting to defend themselves. A wasp sting has a $\mathrm{pH}$ of $10$ and a bee sting has a $\mathrm{pH}$ of $2$. What would you add to a wasp sting to neutralise it and stop it from hurting?

Tip: Can you think of any specific examples which would be safe?

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Which soil sample is neutral?

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Cabbage grows better in alkaline soil. Which soil sample would be the best to grow cabbage in?

The table below shows the $\mathrm{pH}$ of four different soil samples which are labelled $\mathrm{A}-\mathrm{D}$.

Use letters from the table to answer the following question.

Potatoes grow better in slightly acidic soil. Which sample would be the best to grow potatoes in?

The earth has four layers.

Name the layers $\mathrm{A}-\mathrm{D}$ in this diagram of the earth.

Which two sentences show the correct facts about the age of the earth?

(i) The earth is more than $4000$ million years old.

(ii) The fossil record gives a time when scientists think the earth formed.

(iii) The age of earth rocks can be measured using chemical tests.

(iv) Rocks on the surface of the earth are all the same age.

There are four layers of sedimentary rock in a cliff (figure given below). How can you tell that $\mathrm{D}$ is the oldest layer.