Is the youngest part of a rock from the bottom up or from the top to the bottom?

How do scientists tell how old a rock is other than that?

What prevents odyssey from killing the sleeping cyclops

What is an endocrine function? (apex) a.esophageal glands release mucus into the esophagus b.salivary glands release saliva into mouth c.swear glands release sweat to the skin d.the pineal gland releases melatonin into the bloodstream

Which must be kept in mind when determining if an explanation is correct? check all that apply.which must be kept in mind when determining if an explanation is correct? check all that apply.