answer:
sedimentary rock is formed when rocks start to weather away causing them to loosen. **weathering is the breaking down of rocks, soils, minerals, and artificial materials through contact with water, atmospheric gases, and biological organisms.** sedimentary rocks are formed from older rocks. the pieces of broken rocks are then transported (through water.) and over time the layers will become compacted (salt crystals 'glue' the layers together.)
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The mean of this set is 7
Answer:
Both are normal distributions but standard normal distribution is a particular case of Normal distribution when the mean is 0 and standard deviation or variance is 1. This makes Y a “Standard” distribution. So basically X is Normally distributed and Y is “Standard” normally distributed.
Polyatomic ions describes ions which are posses more than one atom. Hence, the formula which represents a polyatomic atomic ion is 
- Sulphates contain both Sulphur and Oxygen atoms, hence, they contain two atoms, thus they are polyatomic.
- Sulphide are represented as
; containing only Sulphur atom, hence, they are mono atomic.
- Chlorides are represented as
; containing only chlorine atoms, hence, they are mono atomic.
- Nitrides are represented as
; containing only Nitrogen atom, hence, they are also mono atomic.
Therefore, sulphates are polyatomic as they contain more than one atom.
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