One way in which Earth's evolution as a planet can be understood is by measuring the amounts of certain isotopes in rock. One quantity recently measured is the ratio of Xe-129 to Xe-130 in some minerals. In what way do these two isotopes differ from one another? In what respects are they the same? Please write a minimum of three sentences using the correct grammar and vocabulary to accurately describe your response.

Which explanation is true about what happens to a ray of light when it strikes a mirror? a. a light ray is transmitted toward a mirror at a certain angle. the light ray is then reflected by the mirror at an equal angle but in the opposite direction of the transmitted ray. b. an incident ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then reflected at an angle equal to the angle of incidence but on the opposite side of the perpendicular line. c. a reflecting ray strikes a mirror at an angle with a line perpendicular to the mirror. the light ray is then refracted at an angle equal to the angle of the reflecting ray and on the same side of the perpendicular line. d. an incident ray strikes a mirror at an angle with a line parallel to the mirror. the light ray is then transmitted at an angle equal to the angle of incidence but on the opposite side of the parallel line. you so much! : -d take the time to try and answer correctly.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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?