Which of the following is an example of a physical change in matter? a. fizzing produced when magnesium metal is added to acid b. bending of sodium metal c. sodium metal exploding in water d. magnesium metal burning with a bright white flame

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space