exam 3

Kinetic energy

Streams are able to carry clasts ranging from mud to medium sized boulders depending on their

(all of the above) a lake into which it flows, a larger stream into which it flows, the ocean

The base level of a stream may be

folded sedimentary rocks

The principle of superposition can be used to determine the relative ages of all except

bowl shaped depressions in which snowfields accumulate and create alpine glaciers

Cirques are

there has been some uplift and erosion but no folding between deposition of rocks above and below the disconformity

A DISCONFORMITY occurs when

is made of till

A terminal moraine

broad valleys with broadly meandering streams

Floodplains are associated with

drumlins

Glacial landforms made of till that are asymmetric with their steepest sides facing toward the direction from which the ice advanced are called

are solid

Glaciers are different from the other agents of erosion and landscape formation in that they

streams can erode by dissolving soluble rock but glaciers can't

Glaciers erode the same way streams do except that

the inside of mender loops

Placer deposits of gold form when dense gold nuggets are deposited in

the entire area that feeds water into a stream

a drainage basin is

The steepness of its path through the landscape

The gradient of a stream describes

melting

Streams deposit sediment when they lose kinetic energy by slowing down. Glaciers deposit sediment when they lose kinetic energy by

flow downhill through the previously existing stream carved valleys

Alpine glaciers

headwaters; mouth

The ________ of a stream are where it begins, and its________ is where it flows into another body of water.

how much it meanders

the sinuosity of a stream is a measure of

a series of sedimentary rocks sits upon eroded igneous rocks

A NONCOMFORMITY occurs when

The area in which water normally flows

A stream channel is

outwash

Sediment deposited by meltwater beyond the terminus of a glacier or in tunnels beneath it is called

till

Sediment deposited directly from a retreating glacier is called a

sliding, rolling, and bouncing

Sediment particles move in a stream by

whether a feature is older or younger than another

The term relative age refers to

they flow more slowly

Glaciers are different from streams in that

younger than the rocks based on the principle of cross cutting relationships

If a fault offsets a sequence of sedimentary rocks it must be

graded bedding can help determine whether some beds are older or younger than the beds next to them

If a sequence of sedimentary rocks has been folded and is now vertical

sea level would drop and most stream gradients would increase.

If earth entered another ice age and continental glaciers expanded

glaciers erode at all places in the valleys, not just where the stream channel had been

V shaped stream carved valleys reshaped by mountain glaciers are typically U shaped because

terminal moraines

Well sorted sediment makes up all of the following landforms except

250 million years

A sedimentary rock contains zircon class that have been dated radiometrically as ranging from 1 billion to 250 million yrs old. The oldest the rock can be is

stagnation

A terminal moraine forms during a period of

there is an incomplete geologic record preserved in an area

An angular unconformity is evidence that

very short span of geologic time and lived through out the world

In order for a fossil to be used as an index fossil, the spices must have existed for a

eon

The longest interval of geologic time is a

none of the above

The numerical age of a sedimentary rock can be determined in the field from

a sedimentary rock must be younger than the class that it contains

The principle inclusions states that

very young events

The shorter the half life of a radiogenic element, the more useful it will be for dating

numerical age, and relative age compared with the materials on which they are being deposited

Sedimentary rocks being deposited today on the east and west coasts of North America have the same

How deeply it can erode its channel

the base level of a stream controls

structure and erodibility

Dendritic, trellis and rectangular drainage patterns are the result of

12.5%

after three half lives have elapsed for an element, the percentage of parent element atoms present will be

water slows down

stream deposit sediment when

flow outward from the snow fields in which they form

Continental ice sheets

stream erosion, slumping, soil creep in the valleys

V shaped stream valleys are formed by