A farmer had 15 sheep, and all but 8 died. How many are left?

Obsidian is a volcanic glass that forms when lava cools very quickly and consists of a solid mass of glass through and through. Why is obsidian not classified as a mineral?

In order to useful, a variable must be measurable as a numeric value. True False

You throw a ball straight up into the air at a speed of 15 m/s. You want to know how high above your hand the ball will be at exactly 2.5 sec after you released it.

Which energy transformations occur when a candle burns?

What is the source of all sound

In which region of the periodic table do the elements NOT normally react chemically with other elements? A. metals B. metalloids C. nonmetals D. noble gases

A hot air ballon was a mass of 400 kilograms moves across the sky with 3200 joules of kinetic energy. the velocity of the balloon is

What Is a mineral made of oxidized hydrogen

If you were to go to space, and took your helmet of the suit off while your out side of the rocket, what would happen?

In Step 5, you will calculate H+/OH - ratios for more extreme pH solutions. Find the concentration of H + ions to OH - ions listed in Table B of your Student Guide for a solution at a pH = 2.