Yr 7 Earth And Space (Nsw/australian Curriculum)

Front 1

Celestial

Back 1

Having to do with the sky or space

Front 2

Satellite

Back 2

A small body that revolves around a larger body (such as the Moon around the Earth)

Front 3

Hemisphere

Back 3

Half a sphere. (The equator divides the Earth into two hemispheres.)

Front 4

Solstice

Back 4

The shortest (winter) or longest (summer) day of the year.

Front 5

Equinox

Back 5

The time when the Sun crosses the plane of the Earth's equator, making night and day all over the Earth of equal length.

Front 6

Lunar

Back 6

Having to do with the Moon

Front 7

Solar

Back 7

Having to do with the Sun

Front 8

Altitude

Back 8

Height above sea level

Front 9

Rareified

Back 9

Few in number; of low density or pressure

Front 10

Mortality

Back 10

Liable or subject to dying

Front 11

Susceptible

Back 11

Capable of being affected by something

Front 12

Alpine

Back 12

High mountains, snowy peaks

Front 13

A year

Back 13

The time taken by a planet to revolve around the Sun

Front 14

Lunar eclipse

Back 14

When the Earth passes between the Moon and the Sun

Front 15

Solar eclipse

Back 15

When the moon passes between the Earth and the Sun.

Front 16

Day

Back 16

The time taken by the planet to complete one rotation on its axis

Front 17

Light Year

Back 17

The distance light travels in one year.

Front 18

Galaxy

Back 18

A collection of stars

Front 19

Constellation

Back 19

A recognised pattern of stars

Front 20

Nebula

Back 20

Cloud of gas and dust found between stars

Front 21

Crust

Back 21

The outermost layer of the Earth, about 20 km thick.

Front 22

Mantle

Back 22

The layer of the Earth under the crust, about 3000 km thick.

Front 23

Lithosphere

Back 23

The rigid outer layer of the Earth, including the crust and the upper portion of the mantle.

Front 24

Asthenosphere

Back 24

The more fluid-like layer of the Earth, under the lithosphere.

Front 25

The Core

Back 25

The part of the Earth underneath the mantle. It has a liquid outer layer and a sold inner portion.

Front 26

Humidity

Back 26

The amount of water in the atmosphere

Front 27

Troposphere

Back 27

The part of the atmosphere closest to Earth, about 10 to 15 km thick.

Front 28

Stratosphere

Back 28

The layer above the troposphere to an altitude of about 50 km.

Front 29

Mesosphere

Back 29

The layer above the stratosphere, up to about 80 km altitude.

Front 30

Ionosphere

Back 30

A region of the atmosphere containing layers of charged particles (ions)

Front 31

Thermosphere

Back 31

A layer of the atmosphere from about 80 km altitude, containing the ionosphere and the exosphere

Front 32

Ozone

Back 32

O3

A form of oxygen with three atoms per molecule

Front 33

Ozone Layer

Back 33

A layer of ozone in the stratosphere, about 20 to 40 km altitude, which prevents a large proportion of the ultra-violet radiation from the sun from getting to the Earth's surface.

Front 34

Ozone hole

Back 34

An area above the Antarctic where the ozone layer is thin or nonexistent.

Front 35

CFCs

Back 35

Chlorofluorocarbons, which were used for many purposes in the 20th century but were found to damage the ozone layer.

Front 36

Greenhouse effect

Back 36

The warming of the Earth's surface due to trapped infra-red radiation.

Front 37

Greenhouse gases

Back 37

The gases which are best at absorbing and then re-emitting infra-red radiation, therefore contributing to the greenhouse effect.

Front 38

Hydrosphere

Back 38

That part of the Earth which includes all water.

Front 39

The water cycle

Back 39

The circulation of water around the Earth from one area to the other (e.g. lakes, groundwater, rivers, oceans, clouds etc.)

Front 40

Spring tides

Back 40

The tides where there is the largest difference between high tide and low tide, due to the Sun and Moon being in line.

Front 41

Neap tides

Back 41

The tides with the smallest tidal range due to the Sun-Earth-Moon angle being almost a right angle.