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100
What is an eardrum?
A thin membrane inside the ear that vibrates when sound reaches it.
100
What is the Earth’s crust?
The solid layer of rocks on the surface of the Earth.
100
Which verb means to look at the good and bad points about something, in order to reach an overall decision?
to evaluate
100
What is the name of the process when a liquid changes into a gas?
100
Anything, such as cloth, paper or a layer of sand, through which a liquid is passed to remove suspended pieces of solid.
A filter
200
All the physical environmental factors and all the organisms that are found in a habitat.
An ecosystem
200
What is an element?
A simple substance, made up of only one type of atom.
200
What is a food chain?
A way of showing what eats what in a habitat.
200
Name two types of forces
Push and pull
200
What is geothermal power?
Electricity generated using heat from rocks underground.
300
What is an evidence?
Data used to support an idea or show that it is wrong.
300
What means flammable substance?
A flammable substance catches fire easily.
300
How is called an animal that eats only plants?
herbivore
300
What is hydroelectric power?
Electricity generated by moving water (usually falling from a reservoir) turning turbines and generators.
300
What is filtration?
Passing a fluid through a filter in order to remove solid pieces.
400
How is called an idea about how something works that can be tested using experiments?
hypothesis
400
What is a fossil fuel?
A fuel formed from the dead remains of organisms over millions of years (e.g. coal, oil or natural gas).
400
How is called a substance that cannot be dissolved in a liquid?
insoluble substance
400
How is called a material that does not allow something to pass through it (e.g. heat, electricity)?
insulator
400
What is the unit for measuring energy?
joule (J)
500
What is a distillation?
The process of separating a liquid from a mixture by evaporating the liquid and then condensing it (so that it can be collected).
500
What is a molecule?
Two or more atoms joined together in a group.
500
What is a nervous system?
An organ system that contains your brain, spinal cord and all your nerves and carries signals around the body.
500
A numerical scale from 1 to 14 showing how acidic or alkaline a substance is.
pH scale
500
What is a pitch?
How high or low a note sounds