Science ! 10 points
11. why did we drop the pumice and obsidian in two glasses each, instead of just one each?
12. in an if, then statement, after which word do you usually find the independent variable? what is an independent variable?
13. in an if, then statement, after which word do you usually find the dependent variable? what is a dependent variable?
14. what was the independent variable in the rock density experiment?
15. what was the dependent variable in the rock density experiment?
16. what is a control? was there a control in this experiment?
17. when does data collection take place?
18. was the data collected in this experiment quantitative or qualitative data? how do you know?
19. why is background research important?
20. what should a scientist do if their hypothesis was rejected, or disproven?
21. put these items in order from greatest to least density. water, pumice, obsidian.