earth science test 6

Question 1

What is energy

Answer 1

the ability to do work

Question 2

what is potential energy

Answer 2

stored energy - increases with height

Question 3

what is Kinetic energy

Answer 3

energy of motion - temperature is the average kinetic energy of molecules

Question 4

what is absolute zero?

Answer 4

when all energy ceases to exist

Question 5

absolute zero facts -

Answer 5

.it is the lowest possible temp
.0 , -460F, -273C

Question 6

What is conservation of energy?

Answer 6

the principle which states that energy can neither be created or destroyed, only transferred in a closed system

Question 7

What is a closed system?

Answer 7

energy cannot escape or enter

Question 8

what is a source?

Answer 8

point of origin of a type of energy

Question 9

What is a sink?

Answer 9

point to which energy flows

Question 10

What is our main source of energy?

Answer 10

the sun

Question 11

energy always flows from…

Answer 11

source(hot) to sink(cold)

Question 12

What is our secondary source of energy?

Answer 12

Radioactive decay from inside the earth

Question 13

Visible light waves-

Answer 13

visible light waves are the parts of the electromagnetic energy that is radiated by the sun and observed with the human eye

Question 14

What is electromagnetic energy?

Answer 14

energy that is radiated, or given off, in he form of transverse waves from all matter not at absolute zero

Question 15

When is the most energy radiated?

Answer 15

when its the highest temperature

Question 16

How are different types of electromagnetic energy distinguished?

Answer 16

by their wavelength

Question 17

What is the wavelength?

Answer 17

its the distance between any two corressponding points on successive cycle

Question 18

What electromagnetic energy does the earth receive the most?

Answer 18

visible light

Question 19

What is more powerful long- wave energy or short wave energy?

Answer 19

short wave energy

Question 20

What cam ultraviolet rays do to your body?

Answer 20

ultraviolet rays can cause sunburns and skin cancer

Question 21

Why is the ozone layer important?

Answer 21

The ozone layer protects us from harmful UV rays

Question 22

Why is our ozone layer being depleted?

Answer 22

it is being depleted due to the use of Chlorofluorocarbons or CFCs

Question 23

Where does energy move away and to?

Answer 23

Energy moves away from an area of high concentration (source) to areas of low concentration (sink)

Question 24

What happends during a dynamic equilibrium?

Answer 24

a region loses and gains equal amounts of energy and usually the temperature of the region remains constant

Question 25

Transfer of energy through radiation -

Answer 25

Transfer of electromagnetic waves through empty space

Question 26

what does transfer of energy through radiation not need?

Answer 26

it does not need a medium to go through empty space

Question 27

The higher an objects temperature the more…

Answer 27

electromagnetic energy it gives off

Question 28

What are examples of transfer or energy through radiation?

Answer 28

sunlight and starlight

Question 29

What is transfer of energy through convection?

Answer 29

transfer of energy due to differences in density

Question 30

where does convection work best?

Answer 30

works best with liquids and gases

Question 31

Why does warm air rise?

Answer 31

(because it’s less dense, cold air sinks because it is more dense, creating convection current) - convection

Question 32

Where does convection occur in the earth?

Answer 32

it occurs in earth’s mantles and earth’s atmosphere

Question 33

What is transfer of energy through conduction?

Answer 33

transfer of energy by direct contact

Question 34

where does conduction work best?

Answer 34

it works best in solids

Question 35

Condcutor vs insulator

Answer 35

things energy transfers through easier VS things energy transfers harder

Question 36

what is one conductor?

Answer 36

metal

Question 37

what is one insulator?

Answer 37

styrofoam