rosanna+-+natural+disasters

= natural disasters! =

week one
=i have learnt how to change the colour and size of the font in my wiki spaces.= =i have learn't that a disaster is a misfortunate, unwanted event. a natural disaster however is still a misfortunate and unwanted happening although it is caused by mother nature. and is a far more dangerous, for it can put people in life risking situations. we also discussed seasons and how the earth rotates.=

questions:
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this week we have learn't all about how to insert things such as how to put in a video and voki's on our wiki pages. we have been concentrating on customizing and rearranging our wiki's. we have also revised on what we have learn't. discussing what natural disasters have occurred just recently.

= questions: = what is a disaster? = A disaster is a misfortunate, unwanted event. A natural disaster however is still a misfortunate and unwanted happening although it is caused by mother nature. a natural disaster is far more dangerous, for it can put people in life risking situations. =

media type="custom" key="6020175" align="right" what are the different types of natural disasters? information on what i think is the most dangerous natural disaster.
 * valcano** **earthquake** **bushfire** **dust storm**
 * drought** **landslide** **flood** **hurricane**
 * stunami** **cyclone** **twister**

fire introduction

the Victorian black friday bushfire of 13'th January 1939., was claimed to be the most severe natural bushfire in the world, and certainly was the worst for Australia alone at that time. 'but did it over take the blaze ash Wednesday brang us in the south - eastern Australia. 13'th of February 1983?' with in twelve hours this blaze became 180 fires all standing strong fanning by winds at 110km an hour. as you could imagine in it's path it caused waves of destruction through out Victoria and south Australia. now moving on to a most commonly known fire that struck not long back. that's it the black Saturday, that hit us on the 7'th of February 2009. it claimed between 170 - 200 lives but we will nee be sure if there is still more out there. but all these tragedy's cam e from some where and had it's causes. let's take a loo and see what they are.

causes: some basic factors that determine wether a bush fire is going to ouccur or not are fuel, oxygen and an ignition source. More specifically, fire intensity and the speed at which a bushfire spreads will depend on ambient temperature, fuel load, fuel moisture, wind speed and slope angle. wind though also play's a big part with how dangeroud the fire cn be. high winds is huge hazard for allthose in the bushfire prone area. the higher the winds the faster the blaze can travel. which will distinguish how dangerous or safe the fire can be.

affects: many lives and houses have been destroyed in the course of these bushfires but it is not only australia that have these fires but all around. we ask our selves and will through out the fiuture days - "are we realy safe from mother natur?" yes all those incontroluble disasters that we call natural disaster.

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week four
t his week we've been looking at the centre of the earth, the hot lava that bubbles with in an the the plates. using these peices of the earth we discovered that the lava creeps through the plates and the surfaces and errupts in in the places in the area of the ring of fire.there are also more valcanoes in the erea were two plates meet because there is more room for the lava to creep through. i learn't that the plates are allways moving and if one is to crash into anther it will cause lot's of vibration that travels up through the surfaces and resolves into an earth quake.

= questions: =

= = what do we use to classify disasters? I'd say we classify a disaster through it's damage that it has casued.

how are they measured? Earth quake - richter scale Tsunami -tsunameter Valcanoes - volcanic explosivity index/ VEI Bushfire - speed - km/h Hurrricanes - saffir - simpson scale Tornados - fujita tornaedo scale

week five
this week we have learn't about all the planets and there greek/roman names. we have discussed how australia was connected to asia before we moved away. we looked at the astroid belts and the solar systems. i learn't why the earth is round becasue the circle or a cylinder has no weak points there for it is the trongest shape. that's why our bones are round, our heads are round, our legs and arms are round and our bones are round. = questions: = = = what are the layers of the earths structure?
 * 1) crust
 * 2) mantle
 * 3) outer core
 * 4) inner core

what resources do we use from beneath the earth? we use the gems and the stones that travel up to the world through the lava. petrol. rocks - lime stone, chalk. gas. oils.

week six
this week we learn't all about the different types of valcano's. there is the composite valcano's,the sheild valcano's, the splatter and the cinders cones then there's the complex valcano. each of them are very different some viscous ad some not. we discussed about pompeii, and the eruption of Mount Vesuvius. it was not the lava and the heat that killed the people but the cinders and ash that rained heavily, covering the people. only some escaped on bats that they travelled on accross the ocean. the discovery of this town the home of romans, who brought us lot's of useful things, was 1592.

__ questions:

what affects do the sun and the moon have on the earth? The sun has various __ effects on the earth. The main points are light and the warmth. without the light vegetation would not be here without vegetation we would not have oxygen which leads us to discard the idea of survival so you see that the sun has affects on the earth that are important.

The Moon and the sun all have different effects on the way we go about are daily lives. the moon rises when the sun sets, we are awake and Ready in the day time and asleep at night. its because of the way your eyes and Brain respond to the lack of light there is, you get tired when the Moon is up and your body will slowly start to shut down. when the sun rise the peoples brains and eyes will respond to the sudden change of light and your body wakes up again. in conclusion the moon is like a personal timer witch tells people that its time to rest and wait for the new day to arise.

the moon can also control the months and the tides.

__ what are the atmospheric layers? __ the troposphere begins at the earths surface and travels up to a height of 7 to 20 km. the second layer is the stratosphere, as on moves away from the earths surface it reaches closer to the mesophere. the stratosphere is located half way between the troposhpere and the mesophere. the mesophere is the layer above stratosphere the layer above the mesophere is the thermosphere. this layer the mesophere starts at 50 km above the earths surface and reaches up to a height of 85 km high.



week seven
this week we have discussed the layers of the earth to follow up on the questions left on the previous week. learn't that the first layer is the troposphere and it can reach up to as high as 20km, this contains half of the atmosphere and is where weather occurs. The ozone layer sits inside the stratosphere. many aircraft's fly in the stratosphere for it is very stable. The layer above is the stratosphere is the mesosphere. the stratosphere is located between the troposphere and the mesosphere. the next layer is the Thermosphere, then there's the exosphere where the atmosphere merges with space.

questions:

how can comets meteors and astroids affect us? Comets: The things that make up comits are - water ice, dry ice, frozen ammonia, solid methane and several comman atmospheric gases in solid such as oxygen. Comets are thought to be the renmants of the formation of the solar system. there is a huge cloud of them sarounding the sun in a spherical shell that begins right out side the orbit of Pluto. the cloud of comets is known as the Oort comet cloud, it is believed that all the comets we see approaching are comets from this cloud. Every year about 6 new comets are found, this adds to the 700 hundred that have already been recorded in the past. some of them are one off visitors and may never return. others though can take up to 10 000 years to return when others only have a period as short 2 years.

meteors: meteors appear when a chunk of metalic or stony mattar called a meteoroid enters the earths atmosphere from outer space. meteors are mos't commonly known shorting stars or sometimes the brightest meteors are called fireballs. the meteors ar heated through air friction so that it begins to glow and forms a shining trail of gases and melted meteoroid particles. these gases consist of vaporized meteroid material and atmospheric gases, they heat up when the metoroid passes through the atmosphere. mos't of these meteors glow for just a second.

asteroids asteroids are sometimes called minorplanets or planetoids. asteroids are minuture solar system bodiesin orbit around the sun. they are smaller then planets but larger then meteoroids. the distinction between comets and meteors is made on a visual aspect, comets show a perceptible coma while asteroids do not.

in conclusion comets, meteors and astroid sall can cause basically the same problems. injuries, death, property damage.

we learn't about pluto. it is about the size of our moon but yet it has it's own moon half it's size. the gravitational pull of the moon means that the same side of pluto see's the moon all the time. so that they are always moving as one. Pluto is furthest from the sun so it is about minus 230 dagree's celcius. wow that's cold!!!

questions:

how do humans effect nature? we kill wildlife through destroying there shelters and their food. we cut down tree's for paper.

How has human use of the land caused problems? we destroy the land by using the resources, by using the resources we polute the earth by using the resources to make 'stuff.'

week nine
= questions: = how are humans trying to reduce our affect on nature?


 * 1) solar panels.
 * 2) choosing safe energy for homes.
 * 3) we control our transport when needed.
 * 4) water tanks.
 * 5) 4 - minute showers.

=final question = = =

Are we more dangerous to the world then mother nature?
I strongly believe that yes we are more dangerous to the world then mother nature. Natural disasters occur very rarely, where things that harm the environmment of planet Earth that we do can come every year at the least. Most things like droughts and air polution have major affect on our future. when you look at the majority of Natural Disasters that we can cause and can't, there only about two that we can't cause and any other we can. finally this brings me to a my last point, basically we do many other things that harm the environment that are not Natural Disasters and to adapt to the effect of the land we not only cause other things but natural disasters them selves. In conclusion we are a cancer to the world and hopefully we'll cure and fix our mistakes for the future to remain safe.