Lab 6: Remote Imaging

Question 1

remote sensing

Answer 1

the science of obtaining information about objects or areas from a distance, typically from aircraft of satellites.

Question 2

passive remote sensing + example

Answer 2

record natural energy that is reflected or emitted from the Earth

satellite images

Question 3

active remote sensing + example

Answer 3

use internal stimuli to collect data

a laser beam projects a laser into the Earth and measures the time it takes to reflect back

Question 4

alluvial deposits examples

Answer 4

meandering rivers
braided rivers

Question 5

meandering river

Answer 5

the flow is in a single continuous winding channel

Question 6

braided river

Answer 6

the flow is divided into many channels across a wide flood plane

Question 7

point bar

Answer 7

inside of a meandering river’s meander

Question 8

meander scar/cut-off

Answer 8

the point in the meander that cuts off to form an oxbow lake

Question 9

scrolls

Answer 9

surface of point bars appearing as feather edges that point downstream

Question 10

alluvial fan cause

Answer 10

caused by a sudden decrease in slope

Question 11

distributary channels

Answer 11

near where the river enters standing water, levees form and bind the banks of the river. They are deposited during floods

Question 12

aeolian deposits example in Alberta

Answer 12

sand dunes

Question 13

longitudinal dune

Answer 13

a sand dune that forms under conditions of high wind speeds in areas of small sand supply (looks like ripples)

Question 14

barchans

Answer 14

formed in a similar way to longitudinal dunes but with greater sand supply.

Arched hill with a convex side to the wind direction

Question 15

parabolic dunes

Answer 15

more vegetation and decreased wind velocities

arched hill with concave to the wind direction

Question 16

how we recognize landslides on satellite photos

Answer 16

• hummocky surface,
• sag ponds,
• light toned areas called scarps,
• obstruction and diversion of drainage,
• abrupt changes in vegetation

Question 17

sag pond

Answer 17

undrained depression within the displaced material

Question 18

fall

Answer 18

starts with the detachment of soil or rock from a steep slope along a surface on which little or no shear displacement takes place

Question 19

topple

Answer 19

the forward rotation, out of slope, of a mass of soil or rock.

Question 20

slide + 2 types

Answer 20

the downslope movement of a soil or rock mass occurring by shear displacement

translational slide
rotational slide

Question 21

translational slide

Answer 21

planar surface of failure - indicates bedrock

Question 22

rotational slide + other name

Answer 22

(also called slump)

curved surface of failure, concave upwards

Question 23

spread

Answer 23

spreading of material at a very small angle`

Question 24

flow example

Answer 24

sand flows through a crack

the displaced mass exhibits continuous internal deformation

Question 25

avalanche + how can we recognize

Answer 25

snow and ice + debris coarse gravel and boulders are deposited in fans and tongues at the base of slopes

Question 26

what kind of valley do glaciers from

Answer 26

u shape valleys

Question 27

hanging valleys

Answer 27

tirbutary valleys enter over a steep rock-face

Question 28

cirques

Answer 28

deep excavated hollows in mountains from glaciers

Question 29

till

Answer 29

an unsorted and unstratified sediment deposited directly from ice consisting of everything from clay to boulders

Question 30

stratified drift

Answer 30

deposited from the meltwater draining from the glacier

Question 31

what are 2 glacier deposits

Answer 31

till, stratified drift

Question 32

moraines

Answer 32

landforms built up from till

Question 33

drumlin

Answer 33

pointy end points in the direction that the glaciers travel

Question 34

flutings

Answer 34

very elongated drumlins

Question 35

eskers

Answer 35

deposits of stream flowing under the ice of in ice walled channels long thin walls of till (look like veins on a weiner)

Question 36

kames

Answer 36

alluvial cones that build up at the base of glacial streams falling from the glacier surface

Question 37

outwash fan/plain

Answer 37

sediment carried away is deposited in more gentle sloping fans in front of the glaciers

Question 38

kettle

Answer 38

ice falls of the glacier and creates an indent in the ground, then melts creating a pocket of water

Question 39

why are eskers, kames, and some outwash deposits important

Answer 39

since heavier sediment drops first, they can be a valuable source of gravel and valuable minerals

Question 40

How to tell which way a river flows

Answer 40

look at individual meanders. If you split the meander down the middle, water flows from the side that is shorter to the side that is longer

Question 41

reflection seismology formula

Answer 41

t = 2 (d/V) t is directly read from the graph (the time is the time it takes to go there and back)

Question 42

ground penetrating radar signifigance

Answer 42

buried objects appear as hyperbolic shapes

Question 43

how to recognize a scarp

Answer 43

light coloured line that seperates a non landslide area from a landslide area (hummocky, sag ponds)

Question 44

along a meandering river where does mass movement occur

Answer 44

along the scarp, it is only caused by the movement/erosion of ground by the river.

Question 45

how to recognize rotational slide

Answer 45

a curved surface of failure (scarp)

Question 46

how to recognize a translational slide

Answer 46

a straight surface of failure (scarp)