Why is it that the boiling temperature of the water is lower at high elevations than at sea level because the atmospheric pressure is lower at high elevation than at sea level? can someone explain the chemistry behind this?

In what way do investigations build scientific knowledge? the results of investigations lead to questions that cannot be tested. they reflect the opinions and social values of scientists, ensuring valid information. the results of investigations lead to new questions, which lead to new investigations. they are not influenced by the research of earlier scientists, so they are able to address gaps in understanding.i