ak terms hv 1 year 2
area outside the dike
area outside the dyke thatis not protected against the water
beach
the border between land and water where sand accumulates
catchment area
the area drainded by a river and its tributaries
chemical weathering
weathering by wich the compostion of the rock changes due to the action of oxygen and damp
clay
small microscopic grains which are formed due to weathering
delta
new land that formed in the sea by sedimentation at the mouth of the river into the sea
dunes
mounds of sand blown up by the wind
erosion
the continued wearing down of land surfaces by one of the transporting agents: water, wind or ice
erratic boulders
big and heavy rocks carried and left behind by glacial ice
fertiliser
artificial manure made in a factory
fossils
remains of a imprint of an animal or plant
glaciers
large bodies of ice in mountains that as a result of an accumulation of snow and move very slowly over land
granite
igneous rock characterised by specks
high mountain range
a mountain range equal or higher than 1500 metres above sea level
ingeous rock
rock that forms when magma solidifies
limestone
sedimantary rock formed by compressed shells
lower course
lowest part of a river, near sea level
magma
liquid rock in the earths mantle
mass movement
rock moving down a slope due to gravity
manure
dropping of animals used to fertilise fields
mechanical weathering
weathering wich rock crumbles but does not change in compostion
meltwater valley
a valley formed by meltwater from an ice tongue eroding part of a push moraine
middle course
part of the river halfway the upper and lower course
old mountain range
a mountain range with little relief and low, worn down peaks
peat
type of soil formed from compact dead vegetation
plain
flat are with little elevation ( less then 500 metres)
polder
dutch term for an area, often below sea level, surrounded by dykes in which the water level is regulated by pumping stations
pumping station
a pump used to remove water in the polders
push moraines
hills formed by ice tongues pushing land upwards in front of the ice tongues
relief
diffrences in height (shape) of the land surface
river gravel
stones which have been rounded by river water
sand
small grains of rock formed by weathering and still visable by the naked eye
sandbank
shallow area in the sea
sandstone
sedimentary rock formed by compressed sand
sedimantation
proces by which grains come to rest in one place
sedimentary rock
rock formed by layers of sediment rock
shale
sedimentary rock by layers of commpressed clay
terps
manmade hills made to provide safe ground during flooding
tidal flats
the part of the waddenzee that falls dry during low tide
upper course
source of the river, the upper part of the river that often runs trough the mountains
weathering
the breaking down of rock under the influence of the weather and flora
young mountain range
a mountain range with much relief and high and sharp peaks