name 2 substances that can enter the atmosphere and affect weather
TRANSCRIPT
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NAME 2 SUBSTANCES THAT CAN ENTER THE
ATMOSPHERE AND AFFECT WEATHER.
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1. Volcanic ash from an eruption. 2. Greenhouse gases like: Carbon dioxide, water vapor and methane gas.
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WHAT IS A HYPOTHESIS?
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A HYPOTHESIS IS AN EDUCATED GUESS
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HOW MANY FACTORS ARE CHANGED IN A GOOD EXPERIMENT? WHAT HAPPENS TO THE REST?
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In a good experiment only ONE variable is changed and the rest remain CONSTANT (unchanged).
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HOW IS A CONTROL GROUP DIFFERENT FROM AN EXPERIMENTAL GROUP?
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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.
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IF ASKED TO DESCRIBE THE RELATIONSHIP BETWEEN TWO VARIABLES ON A GRAPH, WHAT SENTENCE FORMAT SHOULD WE USE?
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AS _______INCREASES, ______DOES THIS.
As time in seconds increases, distance in kilometers increases.
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EXPLAIN WHY SOME OBJECTS SINK AND OTHERS FLOAT IN
WATER.
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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.
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DEFINE:MELTING,
FREEZING, EVAPORATION, SUBLIMATION,
CONDENSATION, DEPOSITION
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MELTING: SOLID TO LIQUIDFREEZING: LIQUID TO SOLID EVAPORATION: LIQUID TO GAS SUBLIMATION: SOLID TO GASCONDENSATION: GAS TO LIQUID DEPOSITION: GAS TO SOLID
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WHAT IS THE DIFFERENCE BETWEEN
A CHEMICAL AND A PHYSICAL CHANGE?
GIVE AN EXAMPLE OF EACH.
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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.
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DESCRIBE 3 WAYS IN WHICH AN EXPERIMENT CAN BE IMPROVED.
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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.
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CONTRAST THE MOTION OF PARTICLES
IN:A SOLID, LIQUID,
AND IN A GAS.
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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.