Definitions and feedback -WC Flashcards Preview

Geography-- Water and Carbon Cycle > Definitions and feedback -WC > Flashcards

Flashcards in Definitions and feedback -WC Deck (19):
1

what is a flow/transfer

a link between one store or component and another, along which something moves

2

what is a store

a part of the system where something is held for a period of time

3

what is an input

a point where something is added to the system

4

output definition

the point where something is removed from the system

5

what is the system boundary

the edge of the system, the line between one system and another

6

example of inputs in a pond system

precipitation
leaf fall during autumn
seeds carried by winds

7

processes within the pond system

photosynthesis
infiltration
transpiration

8

stored within the pond system

water
soil
plants

9

outputs within the pond system

evaporation
seed dispersal
water infiltrating into soil below

10

what are the main 3 types of systems

open, closed and isolated

11

what is an open system

where matter and energy can be transferred from the system across the boundary into the surrounding environment (most ecosystems are an example)

12

what is a closed system

these have transfers of energy both into and beyond the system boundary but not the transfer of matter (eg sediment cells)

13

what is an isolated system

have no interactions with anything outside the system boundary. no input or output of energy or matter

14

what is the most common type of system

open

15

what is dynamic equilibrium

when there is a balance between the inputs and outputs in a system

16

what is positive feedback

where the effects of an action (eg the increase of CO2) are amplified by subsequent knock-on effects

17

what is negative feedback

where the effects of an action are nullified by its subsequent knock-on effects

18

example of negative feedback (with the stages)

increased use of fossil fuels = increase in atmospheric CO2= global temperature increase = more plant growth= increased uptake of CO2= reduction in atmospheric CO2= reduced global temperatures

19

what are the 5 subsystems on earth

atmosphere
lithosphere (geology)
hydrosphere
biosphere
cryosphere