hydrogen

Hydrogen, with the symbol H, is the first element in the Periodic Table. Its atomic number is 1 and the relative atomic mass it has is 1.0079. It is a reactive nonmetal.

Hydrogen is not what you breathe, it's oxygen!

by Gervy February 01, 2019

QFL

QFL are rocks, either igneous, sedimentary, or metamorphic, and sands that are counted to be quartz (Q), feldspar (F), and/or lithic fragments (L). One of the most counted rocks is chert, a lithic fragment that is sometimes known to be quartz. QFL can be classified in the QFL diagram or QFL triangle.

How many rocks and sands do you know that are found in the QFL triangle?

by Gervy March 07, 2019