Please answer this, im too lazy to do the experiment. 1. What happened to the heavier materials in a mixture when left undisturbed?
2. How can we separate liquid and heavier particles in a mixture?
3. What materials are attracted by the magnet?

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

About 3% of the water on earth is freshest. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use?