<h2>Answer with explanation:</h2>
The correct option is B which is 100°c.
- Boiling point of a substance is a specific temperature point at which the vapor pressure of the liquid equals to the external pressure.
- The temperature of the liquid increases till the boiling point, after that point the given heat is used to break the bonds in the liquid molecules to convert them into vapors.
- After 100°C the water will convert into vapors.
The statement 'Exploring the relationship between the material in a rock sample and its hardness' correctly describes an experimental investigation (Option C).
<h3>What is an experimental investigation?</h3>
An experimental investigation is defined as a procedure used in the scientific method to test an explanation or hypothesis, which can be confirmed or rejected.
In conclusion, the statement 'Exploring the relationship between the material in a rock sample and its hardness' correctly describes an experimental investigation (Option C).
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Redbeds indicate the presence o iron in the environment. Red beds are red sedimentary rocks and the color is due to the presence of the ferric oxides. Ferric oxides occur as a coating on the sedimentary grains. In between the shale and cherts, iron-rich sediments can be found.
<span>Genetic material is passed down from parents to offspring by DNA. The DNA copies itself and the number of chromosomes is split in the half from 46 to 23 chromosomes.</span>
