Module 2
The moisture content of air is called ________.
Humidity
The mass of air surrounding a planet is called its __________.
Atmosphere
The use of electricity to break a molecule down into smaller units is called ___________.
Electrolysis
The majority of the earth's water supply is contained in the __________.
Oceans
Vibration of the earth that results either from volcanic activity or rock masses suddenly moving along a fault is called an ___________.
Earthquake
Even though most ultraviolet light from the sun is blocked, some gets through, and if your skin is exposed to too much of it, you can get a _________.
The atmosphere can be divided into two general layers. The ___________ is the lower layer, and it contains air that has the same composition as the air at sea level.
Homosphere
When you dissolve a substance in a liquid, we say you have made a __________.
Solution
Once water is in a cloud, it can fall back to the earth in the form of _____________.
Precipitation
Some scientists speculate that years ago, all the continents were connected in a giant supercontinent, which has been called __________.
In addition to allowing plants manufacture their own food, carbon dioxide helps regulate the temperature of the earth. Through a process referred to as the ___________ __________, this gas traps heat that radiates from the earth.
Greenhouse effect
The "hole" in the ozone layer is actually a seasonal decrease in the concentration of ozone in the ozone layer. It is centered over _____________.
Antarctica
The chemical name of the salt you put on food is _________ ___________.
Sodium chloride
The crust is separated from the mantle by the ___________ _______________
Mohorovic discontinuity
If you report the ratio of the mass of water vapor in the air at a given temperature to the maximum mass of water vapor the air could hold at that temperature, you are reporting the __________ __________.
Relative humidity.
Ionosphere
Because of _________ _______, individual water molecules are so strongly attracted to one another that they tend to stay together, even when subjected to an outside force.
Hydrogen bonding
When the edge of a glacier advances into the ocean, the ice weakens at some points, and large chunks of ice break off the glacier, floating away in the water. This process, called ________, is what makes an iceberg.
Calving
A _______ is the boundary between two sections of rock that can move relative to one another.
Fault
Automobiles used to be a major source of carbon monoxide, but the introduction of _________ ___________ significantly reduced the amount produced in automobiles by converting the gas into carbon dioxide.
Atoms have the same number of electrons and protons. This means that overall, atoms have no net _________ _______.
Electrical charge
When you make a solution, you use a ________ to dissolve a _________.
Solvent, solute
Water in the atmosphere exists as either humidity or clouds. In order for clouds to form, there must be _______ _____________ ________ upon which water can condense.
Cloud condensation nuclei
The ___________ is the point on the surface of the earth directly above an earthquake's focus.
Epicenter