section 4

Question 1

sources of energy

Answer 1

nuclear
fossil fuels
geothermal energy
biomass energy
hydro energy
solar energy
tidal energy
wind energy

Question 2

uses heat

fossil fuels

Answer 2

Easy to transport
Cheap
but
Pollution!!!
-Non-renewable

are Plants and animals that died millions of years ago

Question 3

uses heat

nuclear energy

Answer 3

efficient, no airpollution and cheap once built,
but,
expensive to build, non-renewable, dangerous, need somewhere to store radioactive waste

nuclear fission, releases an enormous amount of energy. The energy is used as heat in a generator just like fossil fuels.

Question 4

uses heat

geothermal energy

Answer 4

no pollution, cheap and renewable
BUT
only works in certain places, where this heat is making its way to Earth’s surface

uses heat formed inside the Earth

Question 5

uses heat

biomass energy

Answer 5

renewable, uses waste, cheap
BUT
still produces some pollution,
to keep up with demand, crops can be grown just for biomass,-taking away space for other crops

burn biodegradable waste (like fossil fuels)

Question 6

uses water

hydro energy

Answer 6

renewable, no pollution, cheap to run once built
BUT
expensive to build, can cause flood, harms aquatic environment

Plants capture the energy of falling water

Question 7

uses water

tidal energy

Answer 7

renewable, no pollution, cheap to run once built
BUT
expensive to build, only works in some places, harms aquatic environment

uses moving water from tides (waves). The tides/waves spin the turbine.

Question 8

alternative energy sources

solar energy

Answer 8

renewable, no pollution, cheap to run once built
BUT
expensive to build, might not be enough sunlight in northern/dark areas

harnessing the sun’s energy

Question 9

alternative energy sources

wind energy

Answer 9

renewable, no pollution, low operating class
BUT
unsightly, unreliable if not windy

using the movement from wind to turn a shaft/turbine.

Question 10

cogeneration

Answer 10

making double use of energy

energy made for light to light up building, can use waste heat to heat up building (less waste)

Question 11

global warming

Answer 11

greenhouse effect- a layer of our atmosphere that traps a lot of heat in
more carbon dioxide put in the atmosphere, the thicker the layer becomes
- causes warmer temps

Question 12

ozone layer

Answer 12

blocks out one of the harmful types of UV rays
but has a hole in it that is getting bigger and bigger

Question 13

acid rain

Answer 13

causes lots of damage to aquatic
ecosystems

Question 14

fly ash

Answer 14

coal burns, leaving behind a powdery ash
fly ash contains a small amount of mercury

Question 15

sustainability

Answer 15

using resources at a rate that can be maintained indefinitely

Question 16

pros/cons of technological devices
PROS

Answer 16

More ways of staying connected to people

Devices help us do things quicker and more easily, giving us more time for other things

Improve our standard of living

Question 17

pros/cons of technological devices
CONS

Answer 17

Older devices become obsolete, disconnecting people that can’t afford new ones, or increasing waste if they do get a new one

More resources needed to manufacture them