rock formation
what rock is formed by heat and pressure
what is the hardest rock on the scratch scale
diamond
how many types of rocks are there
3
how do you know a tree isn't a mineral
it's living
how old is the oldest rock
4.28 billion years old
what rock is formed by erosion
Sedimentary rocks
10
what are rocks made of
minerals
do rocks have luster
No
how long does it take for rocks to form
1 day to millions of years
what rock forms when magma cools
igneous rocks
do all rocks have scratch marks
no
where do igneous rocks come from
molten magma
what job is to study minerals
mineralogist
can rocks grow
yes they can grow larger and taller
what is created when igneous rocks heat up
magma
what is used to test a rock with a scratch level of 6
steel file
what is the most popular type of rock
Sedimentary
what is one way to tell if something is a mineral
color, streak, luster, hardness, crystal shape, cleavage, specific gravity, and habit.
what is the rarest rock in the world
Painite
what is created when rocks are affected by weathering and erosion
sediments are created
what rock can you scratch with your fingernail
gypsum and talc
where do space rocks come from
space
what do minerals have that rocks don't have
crystal structure
what rock can float
pumice stone