Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods. Relative dating uses observation of location within rock layers, while radiometric dating uses data from the decay of radioactive substances within an object.Know More
Relative dating observes the placement of fossils and rock in layers known as strata. Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last. Relative dating helps determine what came first and what followed, but doesn't help determine actual age.
Radiometric dating, or numeric dating, determines an actual or approximate age of an object by studying the rate of decay of radioactive isotopes, such as uranium, potassium, rubidium and carbon-14 within that object. Radioactive isotopes decay at a fixed rate. This rate provides scientists with an accurate measurement system to determine age. For example, carbon dating is used to determine the age of organic materials. Once something dies, it ceases taking in new carbon-14, and the existing carbon-14 within the organism decays into nitrogen at a fixed rate. Scientists measure the proportion of carbon-14 left in the organism to determine its age.Learn more about Atoms & Molecules
The difference between ferric and ferrous iron is that ferric iron is in a plus-3 oxidation state, while ferrous iron is in a plus-2 oxidation state. This means that ferric iron needs to share three electrons with an oxygen molecule to make the ion neutral, while ferrous iron only needs two more electrons. With the addition of oxygen, the ferrous ion can easily become a ferric ion.Full Answer >
Relative poverty is used to measure wealth in relationship to other members of a distinct population. Relative poverty measurements contrast with absolute poverty measurements, which measure poverty levels based on a set standard encompassing the entire population.Full Answer >
The difference between exothermic and endothermic reactions is found in their names: "endo" means to draw into itself, whereas "exo" means to emit. All chemical reactions either release or use energy, which can be in the form of heat or light. Endothermic reactions need energy that is supplied by their surroundings, whereas exothermic reactions give off energy. Exothermic reactions heat up their surroundings, while endothermic reactions cool them down.Full Answer >
A molecule consists of at least two atoms of the same element, while a compound includes at least two elements. An example of a molecule would be molecular hydrogen, which has two atoms of hydrogen and is represented as H2. An example of a compound would be water (H2O), which has two atoms of hydrogen and one atom of oxygen.Full Answer >