You searched for: “fossil
The remains, impression, or other evidence of a plant or an animal of a former geologic age; especially, parts that are petrified (converted to stone).

The word fossil comes from Latin follilium, which means "dug up from beneath the surface or the ground"; for example, a mole is spoken of as having a fossorial way of life.

As originally used by medieval writers, a fossil was any stone, ore, mineral, or gem that came from an underground source.

Some of the earliest books on mineralogy are called books of fossils. This broad meaning gradually was restricted in the 18th century to objects in rocks that are parts of once living organisms; such as, bones, shells, leaves, wood, etc.

For many years, there was heated debate about the reality of fossils. Some believed that all fossils resulted from a single Noachian flood (relating to Noah or his time) as presented in Genesis (first book of the Bible).

Others thought that fossils grew in place in the rock or had been placed there by Satan to betray humans. Fossils were found that clearly had been parts of plants or animals that were no longer living on earth.

This raised a debate concerning the perfection of organic creation if some species had become extinct. Gradually fossils became generally accepted as records of ancient life.

Fossils demonstrate two truths about the planet on which we live.

  • First, many species have existed and later became extinct.
  • Second, there has been a succession of plants and animals through time so that the communities of life that have existed on earth have gradually changed through time both on land and in the oceans.
—Excerpts compiled from
Life of the Past, 2nd ed. by N. Gary Lane;
Charles E. Merrill Publishing Company; Columbus, Ohio; 1986, page 2.
This entry is located in the following unit: foss-, fossili-, fossil-, fossor- + (page 1)
More possibly related word entries
A unit related to: “fossil
(Greek: fossil, mineral; dug, dig; literally "thing dug")
(Latin: to dig, digging; dug out, dug up from beneath the surface; ditch, trench)
(Greek: track, trace, footprint; pertaining to fossil footprints)
Word Entries containing the term: “fossil
fossil city
A term for a city that is heavily dependent on the use of fossil fuel to maintain its economy and infrastructure; especially, a city whose transit system relies heavily on private motor vehicles.
This entry is located in the following unit: foss-, fossili-, fossil-, fossor- + (page 1)
fossil energy (power) plant
A system of devices for the conversion of fossil energy to mechanical work or electric energy.

The main systems are the Steam (Rankine) Cycle and the Gas Turbine (Brayton Cycle).

  1. Steam (Rankine) Cycle is an ideal thermodynamic cycle that consists of four processes:
    • Heat transfer to the system at constant pressure.
    • An expansion at constant entropy.
    • A constant-pressure heat transfer from the system.
    • A compression at constant entropy; used as a standard of efficiency.
  2. Gas Turbine (Brayton) Cycle, an ideal gas cycle used as a standard for the actual performance of a simple gas turbine, consisting of four processes:
    • A reversible adiabatic (no heat transfer) compression at constant entropy.
    • A heat transfer at constant pressure up to the maximum temperature.
    • An adiabatic expansion at constant entropy back to the original pressure.
    • A heat transfer at constant pressure back to the original volume and entropy.
  3. Entropy in thermodynamics is a measure of the disorder or randomness of a closed system; more entropy means less energy is available for doing work.
  4. The total entropy of an isolated system cannot decrease when the system undergoes a change; it can remain constant for reversible processes, and will increase for irreversible ones.

This entry is located in the following unit: foss-, fossili-, fossil-, fossor- + (page 1)
fossil fuel
Solid, liquid, or gaseous fuels formed in the ground after millions of years by chemical and physical changes in plant and animal residues under high temperature and pressure.

Oil, natural gas, and coal are examples of fossil fuels.

This entry is located in the following units: foss-, fossili-, fossil-, fossor- + (page 1) fuel + (page 1)