Which of the following is not a physical property?

a) water boiling at 100°c

b) a mineral causing a white streak on another mineral

c) sodium exploding when mixed with water

d) a piece of styrofoam floating on water because it is less dense

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

What are transitions between a liquid and a solid called? identify which way they are transitioning

How have the greenhouse gasses increased from the year 2000 to 2018