2nd Half of EAS

In a region with an ephemeral stream, the water table drops below the stream channel for at least part of the year, resulting in a dry channel, but water flows for other parts of the year.

True

The "thalweg" is:

The deepest part of a river channel

Which of the following will NOT result in a change in base level?

Headward erosion

In the following, the microscope image of the right-most rock sample is most likely to have been found in which sort of environment?

Beach environment, transported far from source

The extinction of the dinosaurs (and many others) at the end of the Cretaceous Period is widely thought to be related to the impact of a large meteorite.  Evidence for this includes:

Large impact structure of appropriate age found offshore of Yucatan

Particles of molten glass and "shocked" quartz

Concentration of iridium and other elements in sediments of that age, elements that are rare on Earth but common in meteorites

The Rocky Mountains in North America have a slightly unusual origin story.  Which of the following is hypothesized about their cause?

Subduction of a more buoyant oceanic plateau, causing flattening of the subduction zone and compression inland

Put the following types of time divisions in order, from longest (1) to shortest (5).

1. Eon

2. Era

3. Period

4. Epoch

What is the age of the oldest mineral grain that has been found on Earth? Put your answer in billions of years, i.e., 2.3 billion would be 2.3.

4.4

Place the following events in order

Most recent

Illinoian Ice age

Evolution of flowering plants

Jurassic

Extinction of 2/3 of species on Earth, perhaps associated with Siberian Traps (extensive volcanic activity)

Carboniferous

Deposition of major salt layers found in upstate New York

Cambrian

Earliest life on Earth

Hadean

Oldest

At what point in Earth's history do we see the first evidence of life?

3.8 Billion Years

A stratigraphic formation is which of the following

An interval of strata  that extends over a fairly large area, composed of a specific, fairly uniform rock type 

Match the type of unconformity with the observation: angular unconformity

Strata above have a different dip than strata below

Match the type of unconformity with the observation: conformable

Match the type of unconformity with the observation: disconformity

A gap in the fossil succession or a surface of erosion/weathering

Match the type of unconformity with the observation: nonconformity

sedimentary rock on top of igneous/metamorphic rock