h2O
what dose H2O stand for?
it stands for two hydrogen atoms and and one oxygen.
what causes earthquakes?
the release of energy when tectonic plates collide pushing up the crust
where does sound travel faster: water or air
sound travels faster in water because the density and the elasticity are higher than in air.
what is the chemical symbol for water
h2o
octopuses have 3 hearts
true
what is the density of water
4.c it gets denser when it is ice
how can you tell when a earthquake is coming
the well water starts to rise and animals will seem scared or shaking
why do objects fall
they fall because of gravity
what is the center of a atom called
nucleus
adult humans have 200 bones
false they have 206
how much of earth is water
about 97%
how do mountains form
they form by the collision of tectonic plates which pushes the earth's crust
can fire have a shadow
no because it's a light source
what are 3 basic parts of an atom
protons, neutrons and electrons
sharks have bones
false they have cartilage
why can't people drink salt water
because the water can dehydrate you
why does the earth orbit around the sun
because of the gravitational pull from the sun
what is energy that is stored
potential energy
is breaking glass a physical or chemical change
physical change
it takes 8 minutes and 20 sec for light to get from the sun to earth
true
how many gallons of water is in Lake Superior
it has 3 quadrillion gallons of water
what is gravity
gravity is a force that pulls things down, so they don't float around
what is the energy of moving matter
kinetic energy
what does an atom become when it loses an electron
positive
the pacific ocean is the deepest ocean in the world
true