MDL 4 History of the Earth

The closest distance of the Earth to the Sun.

• apogee

• aphelion

• perihelion

• perigee

It is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.

• Radioactivity rocks

• Radiometric dating

• Radiometer device

• Radioactivity charges

This is sometimes called numerical dating, to give rocks an actual date, or date range, in number of years.

• absolute dating

• radioactivity energy

• relatively dating

• fossils

This device measuring the amount of radioactive parent and the amount of stable daughter elements.

• Thermometer

• X-ray

• Thermodynamics

• Mass spectography

He calculated the rate of delivery of salt to the ocean.

• Hutton

• Usher

• Joly

• Palissy

The ____________ shows the immensity of geologic time and correlating geologic events on a Reference Links worldwide scale

• mass spectrograph

• stratification

• fossilization

• geologic time scale

The idea that most beds are laid down horizontally or nearly so is called the ____________.

• Principle of Original Continuity

• Principle of Fossil Succession

• Principle of Cross-Cutting Relationships

• Principle of Original Horizontality

If rock A cross cuts rock B, then rock A is:

• older than rock B

• younger than rock B

• the same age as rock B

• on top of rock B

Which subdivision of geologic time is the longest?

• PHANEROZOIC EON

• MESOZOIC ERA

• TERTIARY PERIOD

• HADEAN EON

A nonconformity is _________.

• a rock unit that is different than units above or below it

• a gap in the geologic record bounded below by metamorphic or igneous rocks and bounded above by sedimentary rocks

• a rock unit that does not contain fossils

• a sequence of rocks that does not contain any gaps in the geologic record