solid object found in nature that has never been alive
a measure of how difficult it is for a mineral to be scratched
a naturally formed solid made of one or more minerals
rock that was once melted and then cooled and hardened
rock made when materials settle into layers and get squeezed until they harden into rock
rock that has been changed by heat or pressure
the part of soil made up of broken down pieces of dead plants and animals
soil with grains of rock that you can see with your eyes alone
soil with grains of rock that are too small to see with your eyes alone
soil with very, very tiny grains of rock (holds water)
soil that is a mixture of humus, sand, silt, and clay
the breaking down of rock into smaller pieces
the movement of weathered rock and soil
the hardened remains of a plant or an animal that lived long ago
describes a kind of living thing that is no longer found on Earth
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.