Pure substances contain only one type of a. atoms only. b. molecules only. c. atoms or molecules. d. mixture.

Pure substances contain atoms only. You cannot break down a pure substance.  An element is always uniform all the way through. An element CANNOT be separated into simpler materials except during nuclear reactions.

answer: option (4) is the correct answer.

explanation:

areas which are at low altitudes and near the equator tend to receive direct sunlight from the sun. hence, heat energy or radiations from the sun make these areas warmer and they have warmest water.

whereas areas which are at high altitudes and away from the equator do no receive direct sunlight. hence, no direct contact from the sun makes these regions colder and thus, they have colder water.

thus, we can conclude that the statement areas at low latitudes near the equator have the warmest water because they receive the most direct sunlight best explains the relationship between an area's geography and the temperature of its surface water.

the correct answer is option d

explanation:

i was wrong its d because they dont use cm when calculating square roots