| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.59 |
| Score | 0% | 72% |
Water freezing or boiling is an example of which of the following?
cooling |
|
phase transition |
|
sublimation |
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heating |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Changes to an object's speed or direction of motion are caused by which of the following?
power |
|
kinetic energy |
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a force |
|
work |
Force is applied to change an object's speed or direction of motion.
Which of these is not a component of blood?
red blood cells |
|
plasma |
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white blood cells |
|
marrow |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
radiation |
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convection |
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conduction |
|
reflection |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Which of the following is not part of the carbon cycle?
decomposition |
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precipitation |
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photosynthesis |
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respiration |
The carbon cycle represents the ciruit of carbon through Earth's ecosystem. Carbon dioxide (CO2) in the atmosphere is absorbed by plants through photosynthesis. Plants then die and release carbon back into the atmosphere during decomposition or are eaten by animals who breathe (respiration) the carbon into the atmosphere they exhale and produce waste which also releases carbon as it decays.