Question

questions 3 through 5 refer to the following. a group of students wanted to determine if soil texture can vary by location. several students brought in a sample of soil from their backyards. each student added their soil sample of equal mass to a jar with exactly the same amount of water, shook the contents so that all soil particles were suspended in the water, and left the jars covered overnight. the next morning, the soil particles had settled out into layers and students could determine the percentage of each type of particle. the results of their soil test are shown below. soil texture test results soil sample a 10% clay 10% silt soil sample b 20% clay 40% silt soil sample c 80% clay 10% silt 4 mark for review which of the following describes the dependent variable in this investigation? a percentage of each particle size in each soil sample b soil samples taken from different locations c time required for each soil sample to settle d addition of water to each soil sample

Explanation:

The dependent variable is what is being measured or observed and is affected by the independent variable. In this experiment, the students are interested in how soil texture (measured by percentage of particle - size) varies by location. The percentage of each particle size in each soil sample is what they are measuring as the outcome, which depends on the location of the soil sample. The soil samples from different locations is the independent variable, time is a controlled factor, and addition of water is a part of the experimental procedure.

Answer:

A. Percentage of each particle size in each soil sample