Test 8, Chapter 8 Flashcards Preview

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Flashcards in Test 8, Chapter 8 Deck (39):
1

The basic cause of all weather is the

sun

2

Scientists who study the weather are called

meteorologists

3

The imaginary line running through the earth from North Pole to South Pole is the

axis

4

The air that we live in receives most of its warmth from the

ground

5

Different seasons are caused by the ___ of the earth's axis.

tilt

6

Winds are produced by ____ differences on the earth.

temperature

7

Warm air is ____ than cool air.

lighter

8

The earth's surface spins at over ____ miles per hour.

1,000

9

You will label the following on a diagram of the earth & mark the 2 areas that have the most changeable weather.

polar easterlies
prevailing westerlies *
northeast trade winds
southeast trade winds
prevailing westerlies *
polar easterlies

10

The amount of water vapor that the air can hold at a given temperature is the ____ of the air.

relative humidity

11

The lowest possible temperature at which air is able to hold all of its water vapor is its

dew point

12

the process in which water vapor leaves the air and changes into liquid water is called

condensation

13

Air is saturated when the humidity of the air is ___ percent.

100

14

Water vapor that condenses to form liquid water on the ground is called

dew

15

water vapor that condenses and forms frozen water on the ground is called

frost

16

An ice crystal in a cloud becomes too heavy, falls, melts, and lands on the earth as liquid water.

rain

17

falling ice crystals melt slightly, stick, and freeze together into snowflakes

wet snow

18

falling ice crystals melt into raindrops, then refreeze and land on earth as tiny pieces of ice.

sleet

19

falling ice crystals melt, hit the earth as liquid rain, but refreeze as soon as they land

freezing rain

20

a small piece of ice is tossed up and down inside a cloud, forming several layers of ice, until it is too heavy and falls to earth.

hail

21

puffy, bulgy clouds belong the the ___ family

cumulus

22

layers of flat clouds belong to the ___ family

stratus

23

wispy, curly clouds very high in the atmosphere belong to the ___ family

cirrus

24

sheets of clouds that often produce rain are___ clouds

stratus

25

clouds made of very small ice crystals are ___ clouds

cirrus

26

"thunderhead" is another name for a ___ cloud

cumulonimbus

27

a term used to describe a cloud from which rain is falling is

nimbus

28

the broad, flat top of a cumulonimbus cloud is called an ____ top.

anvil

29

When opposite electrical charges build up in very tall clouds ___ is produced.

lightning

30

The rapid expansion of superheated air causes shock waves that we hear as __

Thunder

31

the type of storm that packs the most destructive power into the smallest space is the ____

tornado

32

the calm region of very low air pressure in the center of a tornado is called the ___

eye

33

If a tornado has been spotted, meteorologists issue a tornado ___

warning

34

The thin channed of charged air through which a lightning bolt can travel is the ____

step leader

35

Lightning bolts that do not come in contact with the ground but remain within the cloud are known as ____ lightning.

sheet

36

The row of thunderheads that builds up in the front of advancing cold air is called a ___ line

squall

37

The boundary between two air masses is called a

front

38

List 7 precautions you should take during a thunderstorm.

1. stay indoors
2. a car is a safe place to be
3. if you are outside, avoid being the tallest object
4. stay away from high ground or open, flat areas
5. stay away from tall objects such as trees
6. avoid being in or near water
7. do not use the telephone or electrical appliances

39

In Pensacola, FL, the temperature is 75 F and the relative humidity is 100%. In Albany, NY, the temperature is 40 F and the relative humidity is 100%. Is the amount of water vapor in the air over Pensacola and the air over Albany the same? Why or why not?

The air over Pensacola contains more water vapor than the air over Albany. The warmer the air is, the more water vapor it can hold. The relative humidity is the same in each city because the air is holding the most water vapor it can hold at that temperature.