Topic Details (Notes format)

Which element is the most abundant in the Earth’s crust?

What is the SI unit of temperature?

What is the atomic number of hydrogen?

What is the smallest unit of life?

What is the main component of natural gas?

What is the most abundant gas in the Sun?

What is the unit of frequency?

Which disease is caused by the deficiency of vitamin C?

Which gas is commonly used in balloons to make them float?

Which disease is caused by a virus?