Geology Final

What is the youngest feature in the figure below.

(The dike on top) Dike A

Which of the following units is the youngest?

(The one on the top) A.

Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with (and 0 atoms of BB), how long will it take for there to be 2,500 atoms of AA?

300,000 years

What is the best explanation for the formation of the moon?

A planetesimal the size of Mars struck the earth, ejecting large volumes of matter. A disk of orbiting material was formed, and this matter eventually condensed to form the Moon in orbit around the Earth

Which of the following best describes the material that makes up the earth's asthenosphere?

A solid that is able to flow.

Who proposes Continental Drift?

Alfred Wegener

A disconformity is

An erosional surface between horizontal sedimentary rocks.

The horizontal line labeled x-x' is a(n)

Angular unconformity

Radiometric dating is possible if a rock contains a measurable amount of _____.

Both parent and daughter isotopes.

Which of the following radioactive isotopes is most useful for dating a very young sample (<20,000 years) of wood?

Carbon-14

You live in the ____ era.

Cenozoic

Which geologic principal was most useful in determining the answer in the preceding question?

Cross-cutting

The cross section of crust below represent two regions of sedimentary rock layers that have been altered. The sedimentary bedrock in both regions originally formed as ____.

Horizontal layers

Where did the heavy elements that make up the bulk of the Earth originate?

In a supernova

The earth's core is composed mainly of?

Iron

_____ describes two atoms with the same atomic number but different mass numbers.

Isotopes

Uranium 238 decays to which of the following daughter isotopes?

Lead-206

The study of fossil succession allows _____.

Matching of similarly aged rocks from different outcrops.

The only layer of the earth that is a liquid is the

Outer Core

Which of the following was NOT used in support of the Continental Drift hypothesis

Paleomagnetism

The supercontinent int he continental drift hypothesis was called.

Pangaea

Which of the following represents the longest time period?

Precambrian

Which of the following principles CANNOT be used to determine the relative age of rocks?

Relativity

~13.82 billion years ago the Big Bang created the ____ from a point source.

Solar System

A very massive star may explode at the end of its life. This is a:

Supernova

George Geologist finds that unit F contains eroded pieces of granite (unit g). Which of the following statements is true?

Unit F is younger than unit G

_____ is thick (30-75 km), old (up to 4,400,000,000 years), composed of feslic (granite) silicates, light (2.7 g/cm^3), and is highly deformed by folding

continental crust

The lisp here is made up of the upper-most mantle and the

crust

An underformed sedimentary layer is ____ than the layer above and ____ the layer below

older — younger