Exam 9: Making Earth

Planetary accretion is the process that gradually accumulates small particles into large different parts of the nebular disk, because of the different condensation temperatures of particles at various distances from the hot protosun.

"The oceanic crust is older than the continental crust because it is deeper." Evaluate this statement.

What does a comparison of meteorite abundances of metals with samples of Earth's mantle help geochemists understand?

What happened to the "leftovers" from the formation of our solar system?

The continental crust has an average age of ________ and a maximum age of ________.

Explain the origin of oceanic crust.

Earth's early atmosphere contained abundant oxygen.

Which of the following are the correct outer planets?

Which explanation best describes how oceanic crust is formed?

Oceans of water and continental crust were present

Figure 9.9 -Using Figure 9.9 in your textbook, which element is present in the mantle in the same quantity as it is present in meteorites?

The rocks that originated during or immediately after Earth's planetary formation are not preserved for study.

Why did the first planetesimals form at the outer edge of the nebular disk?

The final accretion of Earth is thought to have included giant embryo collisions.

What scientific mistake do late-delivery hypothesis scientists claim that water-accretion hypothesis scientists made?

The statement that certain meteorites resemble the composition of the early mantle is

Oxygen most likely accumulated in the atmosphere very gradually after the appearance of photosynthetic organisms, which consume carbon dioxide while manufacturing oxygen.

Which option was not an effect of gravitational push and pull on planetary embryos?

How much material is accreted to Earth from outer space on a daily basis?

The largest reservoir of water on, below or above Earth's surface is/are