year 9 science

Question 1

independent variable

Answer 1

a variable that stands alone and isn’t changed by the other variables you are trying to measure

Question 2

dependent variable

Answer 2

a variable whose value depends on that of another.

Question 3

what are the main types of rocks

Answer 3

sedimentary rock, igneous rock and metamorphic rock

Question 4

how continents and oceans move and change over long periods of time is explained by?

Answer 4

the theory of plate tectonics

Question 5

the way new crust forms under the oceans as a result of underwater volcanic activity

Answer 5

plate tectonics

Question 6

structure of the Earth

Answer 6

core, inner core, outer core, mantle, crust, atmosphere

Question 7

what contributes to the movement of tectonic plates

Answer 7

convection currents

Question 8

what is a subatomic particle

Answer 8

the particles that make up an atom (a particle smaller than an atom (e.g., a neutron) or a cluster of such particles (e.g., an alpha particle)

Question 9

why would all atoms be a certain element

Answer 9

they all have the same amount of protons

Question 10

two positively charged particles tend to?

Answer 10

repel

Question 11

the periodic table arranges elements in order of

Answer 11

increasing atomic number

Question 12

the mass number equals the number of _____ + the number of ____

Answer 12

protons + neurons

Question 13

which subatomic particles are not considered when calculating mass number of an atom

Answer 13

electrons

Question 14

the number of _____ determines which element an atom belongs to

Answer 14

protons

Question 15

what type of charge does protons have

Answer 15

positive

Question 16

what type of charge does electrons have

Answer 16

negative

Question 17

what does each symbol stand for in ohms law

Answer 17

I=current
R=resistance
V=voltage

Question 18

equation for voltage

Answer 18

current x resistance

Question 19

equation for current

Answer 19

voltage divide by resistance

Question 20

equation for resistance

Answer 20

voltage divided by current

Question 21

hang gliders are kept in the air by

Answer 21

convection currents in the air

Question 22

waves transfer what?

Answer 22

energy

Question 23

what describes a series circuit

Answer 23

the components are connected one after the other

Question 24

the _____ of a sound wave relates to its _____

Answer 24

amplitude, loudness

Question 25

the ____ the amplitude, the louder the ____

Answer 25

higher, sound

Question 26

the _____ is related to a sounds ____, or how high or low it sounds

Answer 26

frequency, pitch

Question 27

the longer the ______ and the lower the frequency, the lower the pitch.

Answer 27

wavelength

Question 28

the ____ the wavelength and the higher the frequency , the higher the _____

Answer 28

shorter , pitch

Question 29

_____ lenses cause light rays to converge

Answer 29

convex

Question 30

_____ lenses cause light rays to diverge.

Answer 30

concave

Question 31

the lens in the human eye causes light to converge so it must be_____

Answer 31

convex

Question 32

infectious diseases are caused by microscopic organisms called?

Answer 32

pathogens

Question 33

what is the difference between virus and bacteria

Answer 33

1. bacteria are living the viruses is not
2. bacteria are bigger compared to virus