A student wanted to create a model to show how sedimentary rocks and fossil fuels are formed. She put a layer of blue sand in a jar. Then she added a layer of white sand, a layer of green sand, and a layer of black sand. What would you tell the student to add to her model to show how fossil fuel would begin to form? Write a note to the student with your suggestions for improving her model.

Use the table to identify the phase and phase changes of the elements under the given conditions. write the name of the substance, phase, or phase change

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.