Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Matthew Grade 7 > N/S Life > Flashcards

N/S Life Flashcards

1
Q

Sun

A

One of the hundreds of billions of stars in our galaxy called the Milky Way

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Rotation

A

Earth spinning on it’s own axis
It takes 24 hours
Turns from west to east
(Anticlockwise)
Creates night and day

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Orbit- earth

A

Earths path around the sun
It takes 365 and a quarter days
(Anticlockwise)
Creates the seasons

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Summer Solstice

A

Sun is directly on Tropic of Capricorn
Longest day - shortest night in Southern Hemisphere
21 December

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Winter Solstice

A

Sun is directly on Tropic of Cancer
Shortest day - longest night in Southern Hemisphere
21 June

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Equinoxes

A

Sun is directly on the Equator
Day and night equal length
21 March and 21 September

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Leap day

A

Every 4 years an extra day is added the February to make up for the 4 quarters

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Factors that effect seasons

A

Spherical shape of the earth
Rotation of earth around its own axes
Revolution of the earth in an orbit around the sun
The path around the sun is elliptical (oval)
Axis of earth is at a slight angle to its orbit
Distance of earth from the sun different at different times of year

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Autotrophic

A

Producers
Plants that can produce their own food

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Photosynthesis

A

Carbon Dioxide (CO2) + Water (H2O)
Sunlight
====
Chlorophyll
Food (glucose) + Oxygen (O2)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Chloroplast

A

A cell organelle that is found in green plants

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Fuel

A

An energy source that can be burned to release energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Fossil Fuels

A

Energy found in ancient plants
Coal, Crude oil, Natural gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How fossil fuels were formed

A

Remains of dead plants/animals covered by layers of mud and soil in swamps
This forms layers and layers of sponge material - peat
It can not rot and perish because no oxygen
Over hundreds of years peat is covered by sand, clay, other minerals - turns into fossils
High pressure compresses peat more until it changes into coal, crude oil or natural gas

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Uses of crude oil

A

Manufacture of Petrol, Paraffin and Diesel
SA does not have many reserves - import

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Uses of Coal

A

Eskom to generate electricity
Sasol to manufacture petrol
Burned to keep warm and cook food

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Orbit

A

A set path around a planet or star

18
Q

Satellite

A

Any object that orbits the earth

19
Q

The moon

A

Earths only natural satellite
+/- 384 400 km from earth
No atmosphere, water or life
Gravity 6 time less than earth
Diameter a quarter of earth

20
Q

What is Earths moon called

A

Luna

21
Q

Motion of the moon

A

Turns (rotates) around it’s own axis
Orbits around Earth in 28 days
Moves with Earth around the Sun in 265.25 days

22
Q

New Moon

A

When the moon is between the earth and the sun and cannot be seen

23
Q

Waxing crescent

A

The moon looks like a sickle. Only a small part of the moon can be seen

24
Q

First quarter (Half moon)

A

As the moon moves around Earth, the visible part of the moon becomes larger until it reaches the 1st quarter

25
Q

Waxing Gibbous

A

A larger part of the moon is visible than at half moon

26
Q

Full moon

A

The sunlit part of the moon is at it’s biggest, the full moon can be seen

27
Q

Waning gibbous

A

A part smaller than full moon can be seen

28
Q

Last quarter (Half moon)

A

The sunlit part of the moon becomes smaller until the last quarter is seen

29
Q

Waning crescent

A

The visible part of the moon has decreased. The moon looks like a sickle

30
Q

How many days from New moon to Full moon?

A

14

31
Q

How many days from Full moon to Full moon?

A

28

32
Q

Gravitation

A

A non-contact attractive force that two masses exert on each other

33
Q

What influences Gravity?

A

The mass of the two objects
The distance between the two objects

34
Q

Isaac Newton

A

English scientist
17th century
Saw importance of gravity
Explained orbits of planets with his law of gravity

35
Q

Tides

A

The predictable rise and fall of the sea and sea levels

36
Q

What causes tides

A

The gravitational force that the Sun and Moon exert on Earth

37
Q

High tide

A

When the sea water washes up further onto the beach

38
Q

Low tide

A

When the sea water draws back away from the beach

39
Q

Spring tides

A

Extra High high tide
Extra Low low tide

40
Q

Inter-tidal zone

A

The area between High tide and Low tide

41
Q

Inter-Tidal Animal need to adapt to

A

The availability of water
Changing temperatures
Salt content in the water
Protection against direct sunlight
Forces of breaking waves
Feeding seabirds

42
Q

How do inter-tidal animal adapt

A

Flattened bodies
Protection against drying out
Holes in the sand
Tentacles
Shelter in rock crevices

Matthew Grade 7 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions