easy
painite
what is the rarest rock in the world?
acasta gneiss
oldest rock is....
geology
what is the study of rocks?
extrusive igneous rock
what type of rock is obsidian classified as?
heating and cooling can cause rocks to expand and contract
what can change rocks?
peridotite or gabbro
what is the heaviest rock in the world?
basalt
newest rock on earth....
true
rocks can be used to estimate how old the earth is?
true or false
changes in temperature, water, acids, and salt
what are some agents of weathering and erosion?
(daily double)
rock salt was made
what happened when the sea evaporated?
granite
most commonly used rock?
organisims fossils can be preserved in rocks if buried within the layers of the rock
how are fossils kept in rock for long periods of time?
when magma is trapped in the earth and then molten rock rises to the surface
how is igneous rock made?
because these rocks have gold or silver found in them
why are some rocks called ores?
how are rocks formed in space?
sedimentary, metamorphic, igneous
what are the main three types of rock?
they can be classified by grain or crystal size
whats another way rocks can be classified other than how they're formed?
(daily double)
from deposits of pre-existing rocks or pieces of once-living organism that accumulate on the earth's surface
how are sedimentary rocks formed?
because of air bubbles created during the magma from volcanic rocks hardening making pumice
why can rocks float?
mono-mineralic rock
what type of rock is glacial ice classified as?
grandidierite
which rock is the most expensive (per carat)?
igneous
what type of rock is diamond classified as?
when subjected to hight heat, high pressure, or high mineral rich fluids (all of these can happen simultaniously)
how are metamorphic rocks formed?
building temples, sculptures, statues, jewelry and other things
why were rocks used in ancient times?
when raining the calcium carbonate crystals in the stone react with the minerals from the rainwater, which causes pressure to build up inside of the rock, making the sandstone grow
how does sandstone grow?