a natural, nonliving, solid material found in rock

• mineral
• igneous rock
• sedimentary rock
• relative age
• metamorphic rock

a rock that forms when melted rock cools and hardens

• igneous rock
• mineral
• sedimentary rock
• relative age
• metamorphic rock

a rock that forms when small bits of matter are pressed together in layers

• sedimentary rock
• mineral
• igneous rock
• relative age
• metamorphic rock

the age of one thing as compared to another

• relative age
• mineral
• igneous rock
• sedimentary rock
• metamorphic rock

rock formed from another kind of rock under heat and pressure

• metamorphic rock
• mineral
• igneous rock
• sedimentary rock
• relative age

the process in which rocks continuously change from one type to another

• rock cycle
• mineral
• igneous rock
• sedimentary rock
• relative age

a material or object that has useful properties

• resource
• mineral
• igneous rock
• sedimentary rock
• relative age

decayed plant and animal matter in soil

• humus
• horizon
• soil profile
• topsoil
• pore spaces

a layer of soil that is different from the layers above it and below it

• horizon
• humus
• soil profile
• topsoil
• pore spaces

a view of the different horizons in a soil, from the surface down to the bedrock

• soil profile
• humus
• horizon
• topsoil
• pore spaces