What row on the periodic table only loses a single electron

To run the physics cart, the fan speed of the cart is manipulated. this is the (blank) variable. the cart accelerates due to the speed of the fan. acceleration is therefore the (blank) variable. a “constant” is a parameter that stays the same regardless of the variables. one parameter of the cart that is held constant is the (blank) .

What are chlorofluorocarbons and what impact do they have on the atmosphere?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.