1. NAME 2 SUBSTANCES THAT CAN ENTER THE ATMOSPHERE AND AFFECT WEATHER.

2. 1. Volcanic ash from an eruption. 2. Greenhouse gases like: Carbon dioxide, water vapor and methane gas.

3. WHAT IS A HYPOTHESIS?

4. A HYPOTHESIS IS AN EDUCATED GUESS

5. HOW MANY FACTORS ARE CHANGED IN A GOOD EXPERIMENT? WHAT HAPPENS TO THE REST?

6.  In a good experiment only ONE variable is changed and the rest remain CONSTANT (unchanged).

7. HOW IS A CONTROL GROUP DIFFERENT FROM AN EXPERIMENTAL GROUP?

8.  The control group is given the NORMAL treatment, or a PLACEBO, fake pill, etc.  The experimental group is given the new the new treatment, what is being tested.

9. IF ASKED TO DESCRIBE THE RELATIONSHIP BETWEEN TWO VARIABLES ON A GRAPH, WHAT SENTENCE FORMAT SHOULD WE USE?

10. AS _______INCREASES, ______DOES THIS. As time in seconds increases, distance in kilometers increases.

11. EXPLAIN WHY SOME OBJECTS SINK AND OTHERS FLOAT IN WATER.

12.  Objects with a density lower than that of water (1 g/cm3)will float, while objects with a density greater than that of water will sink.

13. DEFINE: MELTING, FREEZING, EVAPORATION, SUBLIMATION, CONDENSATION, DEPOSITION

14. MELTING: SOLID TO LIQUID FREEZING: LIQUID TO SOLID EVAPORATION: LIQUID TO GAS SUBLIMATION: SOLID TO GAS CONDENSATION: GAS TO LIQUID DEPOSITION: GAS TO SOLID

15. WHAT IS THE DIFFERENCE BETWEEN A CHEMICAL AND A PHYSICAL CHANGE? GIVE AN EXAMPLE OF EACH.

16.  In a chemical change a NEW substance is produced,. For example: burning wood, rusting metal.  In a physical change the substance may change but chemically remains the same. Example: Crumbling paper, or ice melting.

17. DESCRIBE 3 WAYS IN WHICH AN EXPERIMENT CAN BE IMPROVED.

18. YOU CAN IMPROVE AN EXPERIMENT BY DOING ONE OF THE FOLLOWING: 1. Increase the sample size. 2. Increase the number of trials. 3. Control more variable, making sure that ONLY one variable is being changed or manipulated.

19. CONTRAST THE MOTION OF PARTICLES IN: A SOLID, LIQUID, AND IN A GAS.

20.  Gas: Particles are far apart and move very fast.  Solid: Particles are close together and vibrate, moving much slower than in a gas.  Liquid: molecules slide pass each other moving at a speed in between that of a gas and a solid.