What physical characteristics of the bed rock are responsible for the oldest rock remaining at the highest elevation

Two things that biomedical has invented or innvated

The table describes how some substances were formed substance 19 description formed by boiling pure water formed by combining three hydrogen atoms to every nitrogen atom formed by adding 5 g of sugar to 1 l of water formed by compressing carbon under high pressure based on the given descriptions, which substance is most likely a mixture?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?