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the idea that natural processes have operated in the same way throughout the past and present, and will continue to do so in the future.
Uniformitarianism
preserved evidence of the interactions between organisms and their environment, such as footprints, burrows, nests, or feces.
Trace Fossils
the preserved remains or traces of organisms that lived in the past.
Fossils
This principle states that layers of rock are superimposed, or laid down one on top of another. The oldest rock strata will be on the bottom and the youngest at the top.
Law of Superposition
a collection of fossils documenting the history of life on Earth.
The Fossil Record
divides up the history of the earth based on life-forms that have existed during specific times since the creation of the planet.
Geological Time Scale
the remains of the actual organisms.
Body Fossils
the idea that natural processes have operated in the same way throughout the past and present, and will continue to do so in the future.
Uniformitarianism
a geological process that describes the transformation of rocks between the three main types: igneous, metamorphic, and sedimentary
The Rock Cycle
the kind which form when molten rock cools down to a solid-state.
Igneous Rock
form when rocks are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors.
Metamorphic Rocks
are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation.
Sedimentary Rocks
the process by which rocks and minerals break down at the Earth's surface
Weathering
the process by which natural forces, like water or wind, wear away and transport materials like soil or rock
Erosion
the molten or semi-molten natural material from which all igneous rocks are formed and found beneath the surface of the Earth
Magma
layers of rock, or sometimes soil
Strata
