Fossils

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Less than 1% of all organisms that die become fossilized.

The burning of fossil fuels is bad because it causes carbon dioxide levels to rise in the atmosphere. This extra carbon dioxide adds to the enhanced greenhouse effect causing global warming. This is why burning fossil fuels is bad.

If we use more fuels then we should, the planet and mankind itself suffers in the long term. Pollution is a natural and problematic affect of this overuse.

It causes pollution.

Fossil fuels are bad for the environment because they create greenhouse gases which go up in to the atmosphere and magnify the suns heat which can cause ice caps to melt then that leads to the sea level rising which causes flooding and if too much ice melts animals in the Arctic could die.

By using relative age. Over a long period of time, sediment will, layer by layer, coat and cover the fossil, making it difficult for paleontologists and scientists to figure out how old the fossil really is.

Often, but not always!

The definition of a fossil is a whole, part or impression of an organism from a past geologic age, embedded in natural materials, such as rock, sediment, resin, petrified bones, or wood.

One condition that best increases the chance that an organism will become fossilized is if the burial happens rapidly. Another condition that can increase the chance of an organism becoming fossilized is if the organism has hard body parts.

This is because of the way that it is formed.

When you have a rock that is formed through metamorphisis then it has been created through heat and pressure acting on other rocks.

Fossils are inherently delicate things and therefore precious little would withstand the conditions that are required to create marble - and therefore marble hardly ever contains fossils as a direct result of this

The most usually fossilized parts of organisms are bones and shells. These are least likely to rot or wear away before they are buried and mineralised. In rare instances the soft parts of the bodies are preserved and are normally shown as thin films on the rock surface.

paleontology

It can be assumed that the organisms that created the fossils were a part of the same depositional environment and process, and roughly from the same time span of the rock that comprises the layer.

Birds, mule, deer, plants and even some people live in certain areas of the Grand Canyon.

None. A mineral is a naturally occurring, inorganic, homogeneous solid with a definite (but not fixed) chemical composition and an ordered atomic arrangement. As wood is completely organic, there are no minerals in wood.

The age limits for radiocarbon dating anything is about 100-40,000 years.

However, to date the early hominid fossils that have been found in Africa scientists have used Argon/Argon dating to date the volcanic lava and ash it was buried between. The age limits of Argon/Argon dating are 1,000 to the oldest rocks on earth.

Generally, you never really date the item of interest when figuring out the age. You will date items that it was used with, buried with, cooked with, etc. Many different dating methods are used to date the items and the age limits vary between each method.

Fossils are like the clues the police use to solve a crime. Together they paint a picture of the truth - in this case the truth is evolution

Each one tells a story. Like clues to a crime, where the police don't have to find a print of every footstep taken by a subject or confirm every thing that he did, the clues paint a logical outline of all the events around the crime.

Like clues in a crime the police do not initially identify a person they want to pin the crime on and then seek to tie him to the event - they find a number of clues which identify potential subjects of interest. They then attempt to prove the relation of these suspects to the crime until the trail of evidence is strong and dependable. Usually multiple facts on the same evidence are considered - for a crime it might be fingerprints and video tape and eye witnesses, for fossils it could be carbon 14 and dendrochronology and geologic strata.

Fossils are incredibly numerous, particularly for small marine organisms, and plant life. Larger animals are less numerous simply because of predation and because of depositional requirements for preservation.

Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time. Index fossils are found in rock layers. Trilobites and Graptolites are index fossils.

Abundant and diverse fossils first appeared in the Cambrian era, although there is fossil evidence throughout much of the Precambrian.

Fossils are used to show changes because they are permanent. These fossils are also old and show evolutionary changes in species alive today.

A hard shell organism have more of a chance to become a fossil .

Trilobites: The Index Fossil There are many thousands of known species of trilobite fossils found worldwide. Trilobites are considered to be good index fossils because they evolved so rapidly, and this allows geologists the ability to date the rocks in which the trilobites are found. The discovery of trilobites is second only to the discovery of dinosaurs, and new species of trilobites are still being discovered today.

0.2 - 32 inches

This INDICATES that there was once a body of water or a river in this area and it has long since dried up and any organisms that dies there have been fossilized.

The fossil that is formed when an organism is buried in sediment and hardens into rock is called a cast fossil, in which the empty space serves as a mold.

Permineralized fossil are formed when dissolved minerals precipitate from a solution in the space occupied by the organism's remains.