. When is separation of substances necessary ?Name four methods used to separate solid substances ? the one of 2 who send correct answer will get the brainliest and 40 points​

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

Your friend offers to show you an intrusive igneous rock. which of the following would you expect to see?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.