RMM of CaH2=20+(1x2)=22
Number of moles or formula units
=mass/RMM
=8.294/22
=0.377
Answer: C
Explanation: The law of superposition states that in a sequence of rock layers, the youngest layer is on the top, and the oldest one is on the bottom, each being younger than the one beneath it and older than the one above it.
Gold is.........sndjfkfkdkkswk
The answer is option e that is e. Iron and magnesium.
Dark silicates have a specific gravity of 3.2 to 3.6 and are composed primarily of silica tetrahedral and iron and magnesium.
Iron and magnesium is a component of dark silicates that have a specific gravity of 3.2 to 3.6.
So the answer is iron and magnesium.
Answer: weener proposed that a meteor hit earth that caused plate tectonics to shift