Geology
what is it called when two plates collide
convergent
what is abiotic and biotic
abiotic is non-living and biotic is living
how do stars form
gravity pulls together gas
how many valence electrons would an atom have if it is in group 4
4
What is matter in the universe made of?
Much of the observable matter in the universe takes the form of individual atoms of hydrogen
what are the moving plates of the earth's crust called
tectonic plates
which type of cell is the chloroplast in
plant cell
what do black holes look like
black
what are the four main forces
gravity, electromagnetism, weak nuclear force, and strong nuclear force.
How is matter in the universe organized?
The Universe is arranged in a wispy network consisting of huge clusters of galaxies, linked to one another by dense filaments of gas and invisible dark matter and interspersed with gigantic cosmic voids
how do tectonic plates move
convection currents
what type of cell has a cell wall
plant cell
how did the universe start
Big Bang theory
Why do atoms contain the same number of electrons and protons?
The positive charge on a proton is equal in magnitude to the negative charge on an electron.
How do mixtures work?
If no chemical reaction occurs when two materials are mixed, they form a mixture.
why are there same fossils in different continents
continental drift
what type of cell has no cell wall
animal cell
what is the Bohr model
a model of the solar system
Why doesn't the planet Uranus explode if it contains so much hydrogen and methane?
Since Uranus contains effectively zero free oxygen
What is a physical change?
the material involved in the change is structurally the same before and after the change
what is a transform boundary
plates sliding across each other
what is in the chloroplast
chlorophyll
What is the hottest type of star
Blue stars
Why don't metals burn?
because most atoms in a solid chunk of metal don't have access to oxygen atoms, because metals have a high ignition temperature, and because metals are good thermal conductors
what is a chemical change