Quartz also has a hardness level of 7.5, so rubbing another mineral with a 7.5 hardness on it will not effect the quartz.
Angiosperms are flowering plants, so I'd say flowers and the parts of flowers are a pretty common characteristic.
Law of thermodynamics states that matter and energy cannot be destroyed or created, but can be converted from one form to another. A balanced equation ensures that this basic principle is observed.
On the left-hand side of the equation (the reactants), there are 2 Nitrogen moles and 8 Hydrogen moles. After the reaction, the molecules are rearranged. Nonetheless, the moles of Nitrogen and Hydrogen in the products remain the same.
A) Light dependent and light independent/Dark reaction
