What is nitric and nitrous acids?

what is solids ?

How can you identify a lime stone ? pls answer

 Can  you  please  explain  granite  in  a  more  understanding  way!

define peat 

 How do the root nodules help in abrsorbig the Nitrogen?

What is Hemihydrate Calcium  Sulphate ?

how to remember the names of so many metals and ores

 Why is there no video to show how sedimentary rocks are formed ?

 What is sea scum?

What is Diamond

 does the volacano melt because magma is very hot

 How is talc formed ?

What is know as Stratra?

what is "lower layers of strata"