In this activity, you will use models to categorize stars and to explain how past and future space exploration allows scientists to
learn more about stars and their formation. In the process, you
will!
• ask questions to identify and clarify evidence for an argument
• conduct a short research project that answers a question and
allows for further explanation

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3