| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
Water freezing or boiling is an example of which of the following?
heating |
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cooling |
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sublimation |
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phase transition |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
A person's genotype is their genetic makeup and includes:
both dominant and recessive alleles |
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recessive alleles |
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phenotypes |
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dominant alleles |
A person's genotype is their genetic makeup and includes both dominant and recessive alleles. Phenotype is how the genes express themselves in physical characteristics.
Which of the following members of the food chain are most alike?
producers and tertiary consumers |
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primary consumers and omnivores |
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herbivores and autotrophs |
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scavengers and decomposers |
Like decomposers, scavengers also break down the dead bodies of plants and animals into simple nutrients. The difference is that scavengers operate on much larger refuse and dead animals (carrion). Decomposers then consume the much smaller particles left over by the scavengers.
In the Periodic Table of the Elements, elements in the same column belong to the same:
period |
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family |
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group |
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atomic number |
The columns of the Periodic Table are called groups and all elements in a group have the same number of electrons in their outer electron shell. The group that an element occupies generally determines its chemical properties as the number of outer shell electrons establishes the way it reacts with other elements to form molecules. So, because each element has the same number of electrons in its outer shell, each has similar reactivity.
Which of these layers is found directly below the Earth's crust?
continents |
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mantle |
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inner core |
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outer core |
The crust is the Earth's outermost layer and is divided into oceanic and continental types. Oceanic crust is 3 miles (5 km) to 6 miles (10 km) thick and is composed primarily of denser rock. Continental crust is 20 to 30 miles (30 to 50 km) thick and composed primarily of less dense rock. The crust makes up approximately one percent of the Earth's total volume.