Numerical Time in Earth Science

What is Numerical Time?

• A method that determines the exact age of rocks and fossils.

• A method that orders events without exact dates.

• The time it takes for an isoA technique used only in archaeology.tope to decay.

• A technique used only in archaeology.

What is the main process behind Numerical Time?

• Weathering and erosion.

• Radioactive decay of isotopes.

• Movement of tectonic plates.

• Formation of sedimentary layers.

How does Relative Time differ from Numerical Time?

• Relative Time gives exact ages, Numerical Time does not.

• Relative Time orders events, while Numerical Time gives precise ages.

• Relative Time uses radioactive decay.

• There is no difference between them.

Which isotopic method is best for dating ancient rocks?

• Carbon-14

• Uranium-238

• Oxygen-18

• Hydrogen-2

What is the half-life of Carbon-14?

• 1,000 years

• 5,730 years

• 50,000 years

• 4.5 billion years

What material is Carbon-14 dating used for?

• Volcanic rocks

• Organic remains (bones, wood)

• Meteorites

• Igneous rocks

What is the approximate age of meteorites studied with radiometric dating?

• 10,000 years

• 1 million years

• 4.56 billion years

• 500 million years

What factor can affect the accuracy of radiometric dating?

• High temperature and pressure

• The shape of the rock

• The presence of fossils

• The color of the mineral

Which isotope is commonly used to date volcanic rocks?

• Carbon-14

• Uranium-238

• Potassium-40

• Lead-206

Why is Numerical Time important?

• It helps determine the exact age of geological events.

• It is only used for fossils.

• It replaces all other dating methods.

• It is only useful in paleontology.