Gr7 - NS Word Bank

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the divisions of the year into spring, summer, autumn and winter


an imaginary line around the Earth


half of the Earth, divided by the Equator


incoming solar radiation (heat and light)


two dates, 22 December and 21 June, when the Sun reaches its highest point in the sky directly overhead one of the tropics, giving all places on Earth their longest or shortest day or night of the year depending on ' whether they are in the northern or southern hemisphere


two dates, 21 March and 22 September, when the Sun's t oys fall directly on the equator. All places on the earth experience equal night and day - 12 hours each


a measurement of how for away a place is from the equator


spread out or scattered


halfway between the equator: and the Poles


a process whereby plants use the Sun's energy, carbon dioxide from the air and water from the soil to produce energycontaining food


a network of interactions among and bet ween organisms in their environment


dead plants and animals ore decomposed by organisms called decomposers


a natural source of limited supply

non-renewable resources

an object in space that orbits a bigger object

natural satellite

a person who travels in space


to circle; the curved course followed by a heavenly body


the large high tides, with lower low tides in beween, are produced twice each month when the Sun and Moon are in line so that their gravitational pull is combined

spring tides

the small-range tides that occur when the Sun's gravitational pull and the Moon's gravitational · pull are not reinforcing each other

neap tides

satellites designed by . space scientists and engineers for travel in space

space probe

when an object, which is moving around a central point, appears to be moved away from the centre by another force

centrifugal force

the point at which two objects, which started with different temperatures, .reach an equal temperature

thermal equilibrium

the transfer of heat energy between solid objects that are in direct physical contact with each other


a material that does not conduct heat well


the transfer of heat energy through the mov81Tlent of particles in liquids and gases


a flow . of particles from one place to another


when a gas changes to a liquid as it cools


the transfer of heat energy by waves, without contact or movement of particles


heat energy that can be transferred by radiation

radiant heat

a process that does not need energy to make it happen


using energy


a method of passive heat · exchange based on natural convection currents

thermosiphon effect

a space in where there are no particles


a material that absorbs heat from a heat source, and then releases it slowly

thermal mass

a machine that has blades, which are turned by a force like high · pressure steam


gases like carbon dioxide, methane and water vapour that trap heat in the atmosphere and reflect it back causing an increase In temperatures on the Earth

greenhouse gases

a type of sedimentary rock in which oil and natural gas can often be . found


a process used to remove oil and natural gas from layers of rock by pumping water under pressure into it and then blasting the rock blasting the


the splitting of the nucleus of an atom

nuclear fission

electricity that is made using moving water to turn turbines


specialised panels that are adapted to absorb sunlight and convert it into electricity

photovoltaic cells

fuels that come from an organic source such as algae


energy that is stored in a system

potential energy

energy which causes a change or movement

kinetic energy

the standard unit Of measurement Of energy


organisms like plants that are able to convert energy from the Sun into chemical energy


animals that eat plants and other animals


a law that states that energy in a system is never lost but simply converted to a different form

law of conservation of energy

a network of . different sources of energy that interact with one another

energy system

the passing of energy from one part of a system to another

energy transfer

when energy changes from one form to another, for example . . potential energy · to kinetic energy or vice versa

energy transformation

Test your knowledge on the divisions of the year into spring, summer, autumn, and winter, the two solstices, and the two equinoxes. Learn about the varying lengths of day and night experienced by different parts of the Earth during these phenomena.

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