| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.79 |
| Score | 0% | 56% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
|
kinetic energy |
|
work |
|
power |
Force is applied to change an object's speed or direction of motion.
During digestion, after proteins are broken down where does the undigested food go next?
stomach |
|
small intestine |
|
large intestine |
|
esophagus |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
Which of the following describes the Earth's outer core?
primarily solid |
|
makes up most of the Earth's volume |
|
liquid |
|
solid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
As part of the carbon cycle, plants release carbon into the atmosphere through which process?
photosynthesis |
|
decomposition |
|
sedimentation |
|
evaporation |
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.
Earth's breathable air is held in which atmospheric layer?
stratosphere |
|
troposphere |
|
thermosphere |
|
mesosphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.