Which unit is best to use for measuring the width of oak tree leaves?

Which is the best tool for measuring the temperature of lake water?

During a study of the human body, students are asked to observe the back of their hands and record their observations. What units would be most appropriate for measuring the width of their hands?

The distance between Richmond and Norfolk is best measured in -

A student wants to compare the masses and volumes of three marbles. Which two instruments should be used?

Which of these would be the best tool to measure the volume of water absorbed by a sponge?

Students collect pond water in their beakers. Which is the best unit of measurement for the volume of water they collect?

Jose is doing an experiment to see how long it takes an acorn to grow into a 0.5-meter-tall oak tree. Which two instruments should he choose?

A student set up an experiment to test how much bean plants will grow in soil with salt in it. The student grew 50 plants in one group and 50 plants in the other group. The only thing that can be different in the two groups is the amount of -

A student is investigating the time it takes for different objects to reach the ground after they are dropped. The constant in this investigation is the -

Three baseball players investigate to see who can throw a baseball the farthest. They mark off an area on the playground for their investigation. Which should they keep constant?

A science class wanted to know if an empty wagon and a wagon full of books would roll down a ramp at the same speed. Which ramps should the students build to perform a fair test?

Max is doing an experiment on tomato plants. His hypothesis is, "A tomato plant will not grow in a shady area." On which of these relationships did Max base his hypothesis?

Which of the following is an observation about grasshoppers that a science class could have made on their nature walk?