Students were investigating some properties of rocks. They wanted to compare the volumes of the rocks.
Which tool should the students use to accurately measure the volume of each rock?
Some researchers are developing a new fertilizer designed to improve the growth of plants in hot, dry climates. The fertilizer was applied to one hundred desert plants in a greenhouse. The average daytime temperature in the greenhouse was 90°F, and the humidity levels were low. Which is best for the researchers to do next?
A scientist investigates the effect of carbon dioxide on plant height. The scientist grows plants in several closed containers. All the plants receive the same amounts of water and light, but the air in each container has a different amount of carbon dioxide. What is the independent variable in this experiment?
A meteorologist recorded high temperatures for five days at three locations on land. The data are shown in the table below.
The students concluded that the plants grown indoors grew faster because they received better quality light than the plants grown outdoors. Which is the most likely reason this conclusion may be flawed?
Some scientists want to design a system of instruments that will evaluate ocean currents, temperatures, and winds in order to predict weather patterns. What should they do before they produce the first complete working version of the system?
A student filled three identical cups with equal amounts of water. The student placed each cup in a room with a different air temperature. After a few days, the student compared the amounts of water remaining in each cup.
What cause-and-effect relationship does this investigation support?
Students in a science class plan to investigate a factor that affects the rate at which a pendulum swings.
In which way should the students manipulate the variables to get valid results in this investigation?
A student hypothesized that a mouse would learn to run through a maze faster if food was at the end of the maze.
Which tool will best help the student determine if the speed of the mouse improved?
The table shoes different types of pollination data for the fruit from one plant species.
Which graph best represents some of the data in the table?