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Flashcards in geology 3 Deck (26):
1

what is groundwater

water that flows underground
porosity-empty space in rock
permeability-rate of water flowing through rock

2

what is infiltration

water that soaks into the ground

3

some of aeration

pore spaces contain air and some water

4

what is the water table

surface where pore spaces only contain water

5

what is the zone of saturation

area which pore spaces only contain water

6

what is capillary fringe

area above water table -water is pulled above water table

7

what does water table depth depend on

amount of rainfall
-season
-climate
-time between rainfalls
slope of surface

8

what are the karst topography structures

sinkholes
caves
stalactilites
stalagmites
columns

9

what is a desert

arid regions characterized by less than 25cm of rain per year

10

what is the rain shadow effect

air goes over mountain and dry air goes over backside of mountain then absorbs mouisture

11

5 types of dunes

barchan dune
transverse dunes
parabolic dunes
longitudinal dunes
star dunes

12

what are landslides

movement of loose material down a slope
driving force is gravity
trigger-most common is rainfall

13

underlying causes of landslides

steep slopes
over-steepening
overloading the top of the slope
deforestation

14

types of movements and material in a landslide

fall,flow,slide
rock,mud,debris

15

2 types of shoreline features

depositional-sand moves and deposited by ocean currents
erosional-formed by waves weathering and eroding the shoreline

16

what is wave energy

depth is 1/2 of wave length

17

what is longshore current

zigzag motioning surf zone
swash and backwash

18

how is a glacier formed

snow accumulates faster than it melts

19

2 types of glaciers

alpine(valley)-
form in mountains
rivers of ice
continental-
ice sheets

20

how does a glacier advance and retreat

advances-when accumulation exceeds melting
retreats-when melting exceeds accumulation

21

depositional features of glaciers

moraines(till)
lateral
medial
end

22

what are the river stages

stage 1-v-shaped, few tributaries
stage 2-floodplain develops
stage 3-meandering channel,wide floodplain,oxbows

23

what is running water

includes all precipitation that falls on land
moves downhill due to gravity
water is an agent of weathering and erosion

24

what is the source and mouth of a stream

source-a streams beginning, source is a mountain range
mouth-a streams end, a mouth is another body of water

25

what is a delta

landform at mouth that projects into a quiet body of water

26

what is a river system

a river and all of its tributaries
area of land drained by a river system is called a drainage basin