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A magician suddenly jerks a tablecloth out from under the dishes on a table. This best demonstrates
1. an action-reaction pair of forces.
2. that the dishes have inertia.
3. that gravity tends to hold the dishes securely.
4. that the dishes have no acceleration.
Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?
1. Mixtures and compounds are the same throughout.
2. Mixtures and compounds are made of two or more elements in a definite proportion.
3. Mixtures must be separated by chemical methods and compounds by physical methods.
4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Which of the following would be the best place to tap into geothermal energy?
1. volcanic Iceland
2. the plains of Illinois
3. the rain forests of Brazil
4. mountainous Switzerland
Sex organs develop rapidly during                .
1. fertilization
2. puberty
3. menstruation
4. ovulation
A light year is a measurement of
1. time
2. distance
3. temperature
4. star brightness
Grade 8 Periodic Table and Elements
$MgF_2$ is an example of a(n)
1. Ionic bond
2. Metallic bond
3. Covalent bond
4. Noble bond