Telling the time with volcanoes

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Mining Method Of Extracting Iron From Its Ore

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Oldest material on Earth discovered

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Uses and hazards of radiation test questions – Other

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A BBC Bitesize summary of sedimentary rocks can be found here. A list of US The challenges of dating the oldest rocks (New Scientist article).

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Types of Fossils & How They Are Formed

The word fossil comes from the Latin term fossilis, meaning “dug up. Most fossils are found in sedimentary rocks. Fossils can also be found in metamorphic rock, or rock that has been altered by heat or pressure. Rarely are fossils found in igneous rock, which is formed when magma flows and hardens.

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Radioisotopes of elements have a wide variety of uses. Every living organism contains the radioisotope carbon Carbon is formed when neutrons from cosmic radiation collide with nitrogen atoms in our atmosphere forming protons and carbon atoms. Carbon dioxide is responsible for carbon entering the food chain. Carbon decays by beta-emission and has a half-life of years. This means that the beta-decay emissions can be monitored and the data used to calculate how long it has been since the material was alive.

Radioisotopes are used to detect and treat cancer and have various uses in industry. Uses of radioisotopes and carbon dating Uses of radioisotopes Radioisotopes of elements have a wide variety of uses. Cobalt Used in medicine to treat cancer. Iodine Used to treat thyroid gland in the neck. If the gland is enlarged, iodine can be absorbed and will partially destroy it.

Carbon Used to date once-living materials.

Move over Brian Cox? Meet Tim Gregory, TV’s rising science star

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Learn about radiation and how it is used as well as the waste and dangers with BBC Bitesize GCSE Physics. Half life graph showing dating rocks. Y axis.

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Rock cycle

Home About Help Contact Us. Read all about alpha, beta and gamma radiation, their properties and uses. Then try the activity and do the test! Watch the animation on atomic structure, alpha, beta and gamma radiation, what they are, effect on DNA, decay, half life then do the quiz!

The Stone is a tablet of black rock called granodiorite. It is part of a larger inscribed stone that would have stood some 2 meters high. The top part of the stone.

The video explaining radioactive half-life should give you a good start to understanding the concept of radioactive half-life. Half-Life is the time it takes for half of a given sample to decay into stable components. This disintegration of the radioactive sample is via the release of radioactive particles Deer, , November 30 such as Alpha, Beta and Gamma rays. The half-life of a radioactive sample is measured via using a Geiger-Muller counter Deer, , February For example, Radium decays to Polonium, emitting an alpha particle, which is basically a high energy Helium nuclei in the process.

The Radium is said to have undergone radioactive Alpha particle decay. The equation is a shown below. Carbon decays Wikipedia, to Nitrogen emitting a beta particle Whatisnuclear, and is said to undergoe radioactive beta decay.

What is Radioactivity, Half-Life and Radioisotopes

Find out how radioactive decay and preserved ash can be used to date volcanic eruptions…. For geographers and geologists, one of the most obvious questions to ask when we see a volcano is when did it erupt? There are a few ways that we can answer this question. If the eruption was in recent history, people might have recorded it , and for example, we have many different record types for the eruption in Pompeii, such as diary entries, paintings, and archaeological artefacts.

Back to main page · Back to GCSE · Back to Restless Earth. Supervolcanoes One Geologist in Idaho knew of a volcanic eruption dating from the same time. The magma gets stuck and pools, melting the rock around for thousands of years.

Carbon has a large number of stable isotopes. All carbon atoms contain six protons and six electrons, but the different isotopes have different numbers of neutrons. The amount of carbon in the atmosphere has not changed in thousands of years. Even though it decays into nitrogen, new carbon is always being formed when cosmic rays hit atoms high in the atmosphere.

Plants absorb carbon dioxide from the atmosphere and animals eat plants. This means all living things have radioactive carbon in them. When an organism, eg a tree, dies it stops taking in carbon dioxide. The amount of carbon in the wood decreases with time as it decays into nitrogen with a half-life of about years. By comparing how much carbon there is in the dead organism with the amount in a living one, the age of the dead organism can be estimated. The half-life of uranium is million years.

When it decays it forms thorium which is also unstable.

Rock Cycle BBC Videos