Which statement is true about the use of radiation to treat cancer? ?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

In which block of the periodic table is uranium (u) found? s blockd blockp blockf block

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures