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MTTC Earth/Space Science (020) Practice Tests & Test Prep by Exam Edge


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MTTC Earth/Space Science Sample Test

1 of 5

Mrs. Gray's class is conducting an experiment. Mrs. Gray instructs her class to put soil in one container. Then, she asks the students to pour water into a separate container. By separating the soil and water in different containers, Mrs. Gray's class is doing what?

Correct Answer:
testing one variable at a time


by instructing her students to place soil and water into separate containers, mrs. gray is demonstrating a fundamental practice in scientific experimentation: testing one variable at a time. this approach helps to isolate the effects of one variable on an experiment's outcome, ensuring that the results are clear and meaningful.

in the context of mrs. gray's class experiment, the separation of soil and water might be aimed at observing their individual properties or behaviors without interference from each other. for instance, if the experiment's purpose is to study the absorption rate of different soils, having water in a separate container prevents it from prematurely interacting with the soil, which could skew the results.

it's important to note that the experiment is in its early stages. this implies that the students have yet to introduce or modify other variables that might be part of the study. additionally, the experiment currently lacks a control setup—an essential component in many scientific experiments that helps compare findings and affirm the effects of the tested variable. a control, such as an empty container or a container with a known quantity of water or soil, would provide baseline data against which changes can be measured.

given that the experiment is still being set up, it is premature to discuss controlling every aspect of the experiment or designing future experiments. these steps are usually considered once the initial hypothesis has been tested and initial data have been analyzed. at this stage, mrs. gray and her students are likely still defining the dependent and independent variables and ensuring that their experiment's design will effectively test their hypothesis.

in summary, by keeping soil and water in separate containers, mrs. gray is enabling her students to methodically test and observe the properties or interactions of one variable at a time. this foundational strategy in scientific experimentation enhances the clarity and reliability of their findings, setting a strong precedent for good scientific practice among the students.
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