year 9 science Flashcards
independent variable
a variable that stands alone and isn’t changed by the other variables you are trying to measure
dependent variable
a variable whose value depends on that of another.
what are the main types of rocks
sedimentary rock, igneous rock and metamorphic rock
how continents and oceans move and change over long periods of time is explained by?
the theory of plate tectonics
the way new crust forms under the oceans as a result of underwater volcanic activity
plate tectonics
structure of the Earth
core, inner core, outer core, mantle, crust, atmosphere
what contributes to the movement of tectonic plates
convection currents
what is a subatomic particle
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)
why would all atoms be a certain element
they all have the same amount of protons
two positively charged particles tend to?
repel
the periodic table arranges elements in order of
increasing atomic number
the mass number equals the number of _____ + the number of ____
protons + neurons
which subatomic particles are not considered when calculating mass number of an atom
electrons
the number of _____ determines which element an atom belongs to
protons
what type of charge does protons have
positive
what type of charge does electrons have
negative
what does each symbol stand for in ohms law
I=current
R=resistance
V=voltage
equation for voltage
current x resistance
equation for current
voltage divide by resistance
equation for resistance
voltage divided by current
hang gliders are kept in the air by
convection currents in the air
waves transfer what?
energy
what describes a series circuit
the components are connected one after the other
the _____ of a sound wave relates to its _____
amplitude, loudness
