A volcano is an opening, or rupture, in aplanets surface or crust, which allowshot magma, volcanic ash and gases to escapefrom the magma chamber below the surface.
Deep below the Earths crust, thetemperatures andpressures are great enough to melt rock.When this moltenrock blasts to the surface, the result is avolcano - and forthe inhabitants of the place, its as if Hellhas been let loose.
Why doVolcanoes occur? Volcanoes occur when the Earths plates pull apart causingmagma to rise to the surface.Volcanoes can also occur overhotspots and where one plate dives beneath another,forcing magma to rise to the surface. Plates diving underone another is known as subduction. Where doVolcanoes occur? Volcanoes usually occur on the edges of plates, similar towhere earthquakes occur. A lot of volcanoes occur in thearea around the edge of the Pacific ocean called the PacificRing of Fire.Volcanoes can also occur in the middle ofplates, in hotspots. One such hotspot has formed theHawaiian islands chain. As the earth rotated, it passed overthe hotspot and new islands were formed.
What are landslides and how do they occur? Landslides have always existed on our planet.Generally classified as mass movements of rock,debris, and soil down a slope of land. Whilelandslides are a naturally occurringenvironmental hazard they have recentlyincreased in frequency in certain areas due tohuman activity. Although there are manydifferent causes of landslides, they all have twothings in common.They are the results of thefailure of the soil and rock materials that makeup the hill-slope and they are driven by gravity."
WEATHERING Weathering is the breaking downof rocks, soils and minerals as well as artificialmaterials through contact with the Earthsatmosphere, biota and waters.Weatheringoccurs in situ, or "with no movement", andthus should not be confused with erosion,which involves the movement of rocks andminerals by agents such as water, ice, snow,wind, waves and gravity.
ErosionThe removal of solids like sediments,soil rocks and other particles in thenatural environment.
THE ERODEDMATERIALS GETS SETDOWN INTHE EARTHSURFACE.
DUETOTHESE PROCESS DIFFERENTLANDFORMSONTHE SURFACE OFTHEEARTH .LANDFORMS FORMED BYTHE RIVER
WATERFALL AWATERFALL IS A PLACE WHERE FLOWINGWATER RAPIDLY DRROPS IN ELEVATION AS ITFLOWS OVER A STEEP REGION OR A CLIFF.MEANDERSA meander, in general, is a bend ina sinuous watercourse or river.A meander isformed when the moving water in a streamerodes the outer banks and widens its valleyand the inner part of the river has less energyand deposits what it is carrying.
OX BOW LAKEAn oxbow is a crescent-shaped lakelying alongside a winding river.The oxbow lake is created overtime as erosion and deposits ofsoil change the rivers course.
FLOODPLAINA floodplain or flood plain is an area of landadjacent to a stream or river that stretchesfrom the banks of its channel to the base ofthe enclosing valley walls andexperiences flooding during periods of highdischarge.
LEVEES Naturally formed raised bank along the side of ariver channel are called natural environment .The river approaches the sea the river begins tobreak up into many streams called distributaries
LANDFORMS FORMED BYTHE SEAWAVESDueto continuous strikesof sea wavesat therocks,cracks appear in therocks.Changesappear in the rocks.