hard

When Ibn Sina was 13 years old, what did he learnt?(answer 2)

• maths

• rapture

• al quran

• medicine

• science

what is being added to reduce acidity of water

• alum

• lime

• chlorine

• fluorine

• nitrogen

An example of water brand in Brunei

• Awater

• Evian

• Fiji

• Dasani

• Aquafina

What is the step in the water cycle where rainfall is called?

What process take place when the lumps sink to the bottom of the tanks in water treatment process?

What did Abu-Bakr learnt?(answer 2)

• medicine

• al quran

• arab

• philosophy

• science

What is coagulation in water treatment process