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Science Class: Grade 6 > Final > Flashcards

Final Flashcards

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1
Q

seismology

A

The study of earthquakes

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2
Q

elastic rebound

A

The sudden return of elastically deformed rock to its undeformed shape

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3
Q

Richter Scale

A

Used to measure the strength of earthquakes with magnitude

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4
Q

Mercalli Scale

A

Used to measure earthquakes using intensity

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5
Q

deformation

A

The bending, tilting, and breaking of the Earth’s crust; the change in the shape of rock in response to stress

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6
Q

seismic waves

A

A wave of energy that travels through the Earth, away from an earthquake in all directions

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7
Q

earthquake hazard

A

The measurement of how likely an area is to have damaging earthquakes in the future

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8
Q

seismograph

A

An instrument that records vibrations in the ground and determines the location and strength of an earthquake

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9
Q

retrofitting

A

The process of making older structures more earthquake resistant

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10
Q

Where would you find both the epicenter and the focus of an earthquake?

A

The point on the Earth’s surface directly above an earthquake’s starting point, the focus, The focus is the point along a fault at which at the first motion of an earthquake occurs

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11
Q

P waves

A

P waves (primary waves) can travel through solids, liquids, and gases. They are first detected waves of an earthquake to be detected. They cause the particles of rock to move in a back-and-forth motion

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12
Q

S waves

A

S waves (shear waves) cannot travel through parts of the Earth that are completely liquid. They are the second-fastest seismic waves to be detected. They cause the particles of rock to move in a side-to-side motion

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13
Q

Earthquake safety rules

A

Indoors- Crouch or lie face down under a table or desk in the center of the room
Outdoors- Lie face down away from buildings
In a car- Stop the car and remain inside

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14
Q

volcano

A

A vent or fissure in the Earth’s surface through which magma and gases are expelled

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15
Q

hot spots

A

A volcanically active area of the Earth’s surface far from a tectonic plate boundary

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16
Q

magma

A

Molten rock

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17
Q

caldera

A

A large, semicircular depression that forms when the magma chamber below a volcano partially empties and causes the ground above to sink

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18
Q

crater

A

A funnel-shaped pit near the top of the central vent of a volcano

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19
Q

viscosity

A

The consistency of lava (low = runny & high = thick)

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20
Q

Where do volcanoes usually form?

A

Most volcanoes form on tectonic plate boundaries because this is where magma forms and rises to the surface

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21
Q

What factors are considered when predicting volcanic eruptions?

A

The frequency and type of earthquakes associated with the volcano as well as the changes in slope, changes in the gases released, and changes in the volcano’s surface temperature

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22
Q

volcanic blocks

A

largest pieces of pyroclastic material and are pieces of solid rock erupted from a volcano

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23
Q

volcanic bombs

A

large blobs of magma that harden in the air

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24
Q

lapilli

A

pebblelike bits of magma that hardened before they hit the ground

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25
Q

volcanic ash

A

makes up most of the pyroclastic material in an explosion, and forms when the gases in stiff magma expand rapidly and the walls of the gas bubbles explode into tiny, glasslike silvers

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26
Q

Active volcano

A

currently erupting or show signs of erupting in the near future

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27
Q

Dormant volcano

A

are currently not erupting, but the record of past eruptions suggests that they may erupt again

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28
Q

Extinct volcano

A

have not erupted in recorded history and probably never

will erupt again

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29
Q

What two forms can magma take when it erupts from a volcano

A

pyroclastic flow or lava

30
Q

Pacific Ocean

A

Largest and flows between Asia and the Americas

31
Q

Atlantic Ocean

A

Second largest and the volume is 1/2 of the Pacific ocean; borders NJ coastline

32
Q

Indian Ocean

A

Third largest and is bordered by Asia on the North, on the west by Africa, on the east by Australia, and on the south by Antarctica

33
Q

Southern Ocean

A

Fourth largest and extends from the coast of Antarctica to 60 degrees latitude

34
Q

Arctic Ocean

A

Smallest ocean and most of the surface is covered with ice

35
Q

What does Sonar stand for?

A

Sound, Navigation, Ranging

36
Q

continental shelf

A

The gently sloping section of the continental margin located between the shoreline and the continental slope

37
Q

continental slope

A

The steeply inclined section of the continental margin located between the continental rise and the continental shelf

38
Q

continental rise

A

The gently sloping section of the continental margin located between the continental slope and the abyssal plain

39
Q

abyssal plain

A

A large, flat, almost level area of the deep-ocean basin

40
Q

mid-ocean ridge

A

A long, undersea mountain chain that forms along the floor of major oceans

41
Q

rift valley

A

A long, narrow valley that forms as tectonic plates separate

42
Q

seamount

A

A submerged mountain on the ocean floor that is at least 1,000 cm high and that has a volcanic origin

43
Q

ocean trench

A

A steep, long depression in the deep seafloor that is parallel to a chain of volcanic islands or a continental margin

44
Q

plankton

A

microscopic organisms that drift or freely near the ocean surface

45
Q

nekton

A

animals that swim actively in the open ocean (dolphins, whales, crabs, and sea lions)

46
Q

benthos

A

the organisms that live at the bottom of the sea or ocean (crabs, starfish, coral, sponges, seaweed)

47
Q

living resources

A

fish, seaweed, kelp

48
Q

non-living resources

A

oil, natural gas, sea-floor minerals, tidal energy, and wave energy

49
Q

seaweed

A

species of algae

50
Q

overfishing

A

taking more fish than can be naturally replaced

51
Q

nonrenewable resources

A

resources that cannot be replenished

52
Q

desalination

A

removal of salt from ocean water

53
Q

renewable resources

A

resources that can be replenished

54
Q

What is tidal energy generated from?

A

the natural movement of tides

55
Q

What is wave energy?

A

a clean, renewable resource

56
Q

Why are drift nets a problem?

A

They can accidentally catch dolphins and turtles

57
Q

Why do engineers drill in the ocean floor?

A

to get oil and natural gas

58
Q

Examples of Non-point source pollution

A

oil and gasoline that has leaked from cars, thousands of watercraft, such as boats and personal watercraft, pesticides, herbicides, and fertilizer from residential lawns and golf courses

59
Q

Examples of Point-source pollution

A

oil tankers, waste treatment plants, factories

60
Q

trash dumping

A

trash dumped in the ocean

61
Q

sludge dumping

A

raw sewage flushed down toilets into the ocean

62
Q

oil spills

A

oil dumped in the ocean

63
Q

trash dumping examples

A

bandages, vials of blood, and syringes from hospitals

64
Q

trash dumping effects

A

it can affect the organisms that live in the ocean and those organisms that depend on the ocean for food; Marine animals can mistake plastic materials for food and choke or become strangled

65
Q

sludge dumping effects

A

can pollute beaches and kill marine life

66
Q

how oil spills in the ocean

A

because oil is in such high demand across the world, large tankers must transport billions of barrels of it across the oceans; If not handled properly, these transports can turn disastrous and cause oil spills

67
Q

effects of oil spills

A

they can harm plants, animals, and people, they are responsible for 5% of oil pollution in the ocean; Most of the oil that pollutes the oceans is caused by non-point source pollution on land from cities and towns

68
Q

preventing oil spills

A

tankers are being built with two hulls instead of one; the inner hull prevents oil from spilling into the ocean if the outer hull of the ship is damaged

69
Q

What is adopt-a-beach?

A

when people volunteer to clean up the beach

70
Q

clean water act

A

put the EPA in charge of issuing permits for any dumping of trash into the ocean

71
Q

U.S marine protection, research, and sanctuaries act

A

prohibits the dumping of any material that would affect human health or welfare, the marine environment or ecosystems, or businesses that depend on the ocean

Science Class: Grade 6 (3 decks)

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