Please guys help me with this question.​ please show the working

What is created when solids,liquids,an gases mix with one another

If steel is more dense that lake water, why can a boat float

Hey student studies gravity using objects that have the same mass which two objects have the greatest gravitational force acting between them a. 100kg 1.0m 100kg b. 100kg 2.0m 100kg c. 100kg 2.0m 100kg big d. 100kg big 3.0m 100kg big