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9th grade second semester finals > final part 2 > Flashcards

final part 2 Flashcards

1
Q

which produces the LEAST amount of CO2 when burned?

A

natural gas

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2
Q

which has the potential to be dangerous for thousands of years?

A

natural gas

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3
Q

which fossil fuel produces the MOST CO2 when burned?

A

coal

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4
Q

which is currently the best choice for transportation?

A

oil products

highest concentration of energy

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5
Q

which is the MOST abundant fossil fuel?

A

coal

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6
Q

which is the BEST choice as an alternative to gasoline or diesel?

A

biofuels

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7
Q

which of the following is the main energy source for Iceland, which is on the mid-oceanic ridge?

A

geothermal

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8
Q

why are there so few places to place a dam for reservoirs and this hydroelectric power?

A

you need a valley with a good size river flowing through it

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9
Q

what is the major problem of using either solar or wind as an energy source?

A

they aren’t available 24 hours a day

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10
Q

what are three fossil fuels?

A

oil, coal & natural gas

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11
Q

what should the thermostat be set in the WINTER?

A

68

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12
Q

what should the thermostat be set at in the SUMMER?

A

78

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13
Q

what appliance is the biggest user of electricity in SUMMER?

A

air conditioner

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14
Q

what gas user is the most expensive on a cold day in the winter?

A

heater or furnace

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15
Q

how to keep the house temp. cool during a hot summer day and to keep electricity costs down??

A

close the windows and curtains to keep the sunlight out

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16
Q

in the SUMMER the best way to cool the house down for the next day is to?

A

open the windows

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17
Q

how can you reduce the cost of driving your car?

A

drive steady, drive less & get a car with better mpg

18
Q

in natural selection which animals are able to pass on their genes to the next generation?

A

only their that survive and successfully mate

19
Q

why don’t all individuals of a species look exactly the same?

A

because of mutation there is a huge variety of individuals

20
Q

how is it decided which animals survive to reproduce to the next generation?

A

the environment decides

21
Q

which was the longest period in time? Precambrian, Paleozoic, Mesozoic and Cenozoic

A

Precambrian

22
Q

what happened during the PALEOZOIC era?

A

“old animal” this was when the first animals were around

23
Q

what happened during the MESOZOIC era?

A

“middle animal” age of the dinosaurs

24
Q

what happened during the CENOZOIC era?

A

this is the age of the mammals

25
Q

where does the water for Oakley come from?

A

from the river which comes for the mountains

26
Q

how many people live in California?

A

40 million

27
Q

what percentage of rainfall falls on NORTHERN California?

A

75%

28
Q

what percentage of the pop. of California is in SOUTHERN California?

A

2/3 about 67%

29
Q

what can people do in their homes to cut down on water use?

A

stop watering lawns, shorter showers and flushing toilets so much

30
Q

how do we send water down to Southern California?

A

California aqueduct

31
Q

what happens to the salt content of the delta and SF Bay when the amount of fresh water from the mountains rivers slow down during the summer and early fall?

A

the delta becomes saltier

32
Q

where is the water for Oakley cleaned up before sent to your home?

A

the treatment facility at Empire and Laurel

33
Q

what are the three areas of need for water in California?

A

environment, cities, agriculture

34
Q

which is the only reliable source of water left to supply us until the next winter?

A

reservoirs

35
Q

which is the new source of water for the future?

A

conservation, recycling, maybe even desalination

36
Q

how does groundwater get into the ground?

A

rain percolates into the ground

37
Q

why in California is the level of groundwater getting lower all the time?

A

we are pumping out more water then what’s getting back in

38
Q

describe the water cycle

A

water evaporates from the Ocean, forms a cloud, it rains, water flows into the ground, into rivers, into lakes and eventually back into the ocean

39
Q

how old is the earth?

A

4.6 billion years

40
Q

dinosaurs were alive on the earth for 160 million years. what percentage of the Earth’s history where they around?

A

approximately 3.5%

41
Q

how Long was the earth without organisms big enough to see with your eye?

A

Little over 10%

42
Q

how long have humans been around?

A

approximately 125,000 years or .003% of the Earth history

9th grade second semester finals (2 decks)

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