rocks move down a slope

steep slopes, everyting slides down

slight slpes, only sand slides down

the abrosian (slijtage) of land by sediment in water, snow, ice and wind

sediment is sand, stones, gravel, clay

sediment in water slowly breaks down the land

causes, V-shaped valleys

example, on the beach

sediment in ice breaks the land

causes, U-shaped valleys

because of the weight the glacier slides down a hill and breaks the land

sediment carried by the wind cuts into the rock

rock mostely breaked down at the bottem

sedimentation is a process in wich sediment sinks to the bottem

when a river hardly flows, sediment in the water sinks

first stones sinks to the bottem

after that sand follows

and as last one clay sinks to the bottem

how bigger the sediment how earlier is sinks

when a river enters the sea, all the sediment sinks

after a while new land is formed

magma, liquid material made out of melted rock

once magma cools down it solidfies and becomes very hard. igneous rocks are irregular spotted

formed by the compressing of hundreds of meters of sand clay or other sediment. most of the times you see layers in the stone.

sandstone, made of compressed sand

shale, made of compressed clay

limestone, made of compressed fishes and shells

frost

temperature

biological

composition of rock changes

rain falls from the air

water gets a bit acidic because of plant roots

the acidic water seeps down in little cracks and cravisis in the limestone

limestone desolves

1. mountains

2. heavy earthquakes

3. same density

4.

<- ->

shield vulcano's

small earthquakes

mid-ocean ridge

<- ->

small earthquakes

shield vulcano

mid-ocean ridge

-><-

different densety

big earthquakes

tsunami's

strato vulcano's