Sand is made of tiny pieces of rock that have been worn down by wind and water. Explain why the formation of sand is a physical change. Which is the downward pull on an object due to gravity?

Which of the following are appropriate acceleration units?

Does current flow through or across a resistor?

Ateacher gives students four liquids commonly found in the kitchen - vinegar, apple juice, dish detergent, and milk - and ph indicator strips, which measure acidity. the teacher asks the students to put the liquids in order from most acidic to most basic. what type of investigation could the students conduct to determine the correct order for the liquids?