| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.24 |
| Score | 0% | 65% |
Which of the following is not a medium for sound waves?
liquid |
|
vacuum |
|
none of these is a medium for sound waves |
|
solid |
A vibrating object produces a sound wave that travels outwardly from the object through a medium (any liquid or solid matter). The vibration disturbs the particles in the surrounding medium, those particles disturb the particules next to them, and so on, as the sound propagates away from the vibration.
__________ is caused by a lack of iron in the diet.
anemia |
|
scurvy |
|
diabetes |
|
shingles |
Anemia, which may cause weakness, dizziness, and headaches is caused by a lack of iron in the diet.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
electron shells |
|
atomic mass units |
|
protons |
|
electrons |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.
Which of the following states of matter exists at the lowest temperature?
none of these |
|
liquid |
|
gas |
|
solid |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Which of the following describes the Earth's mantle?
liquid |
|
primarily solid |
|
primarily liquid |
|
solid |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.