NATURAL DIASTERS: ROCKFALLS AND HEAT WAVES

WHAT ARE ROCKFALLS?

• Rockfalls are movements of rock by weathering, bedrock fractures, etc
• Rock falls are under the geophysical disaster type
• Can move in different ways that include: Free fall and Movement near the slope surface
• Many Rock Falls occur in Yosemite National Park
• Rock Falls can also be triggered by Earthquakes

WHAT DO ROCKFALLS LOOK LIKE?

• Rockfalls look like movement of rock by water
• Looks like broken rocks being taken down a cliff at high speeds

WHERE AND WHEN DO THEY OCCUR?

• Occur on Cliffs
• Occur when there are bedrock fractures
• .... Could also occur through weathering
• It could also be caused by freeze thaw
• Another way is tree roots expanding too much

EXAMPLES OF ROCKFALLS

• The Yosemite Rock Fall of July 10, 1996
• 80,000 tons of rock fell
• The rock was coming down at 260 mph
• This Rockfall Caused alot of Physical Damage

EXAMPLES OF ROCKFALLS

• 2013 was a pretty good year for Yosemite
• Rock Falls weren't as steong as usual
• The two most powerful Earthquakes occurred on May 11 and October 5
• 950 tons of rock fell in the first rockfall and 2200 in the other

HUMAN AFFECTS

• Humans affect the environment and usually in a bad way
• People make rock walls for roads and this makes a cliff like structure
• When It rains weathering will cause the Rockfall to happen
• Cutting Down Trees

DIAGRAM

DIFFERENT MOVEMENTS

SAFETY

• Use your Basic Senses
• Walk on Certain Terrain
• Be patient and observe
• Wear protective gear

WHAT IS A HEAT WAVE ?

• Extreme Heat for a long time
• It is a Meteorological Disaster
• Often comes with humidity
• Causes many symptoms
• Is linked with other Disasters

WHAT DOES IT LOOK LIKE?

• Long periods of Time of hot weather
• Many people sufering because of the heat
• A boiling pot of water with extrmely severe weather conditions

WHERE AND WHEN DOES IT OCCUR?

• Occur in Oceanic Climates
• High Pressure
• Less clouds more sunlight

HEAT WAVE GRAPH: NUMBER OF HYPERTHERMIA DEATHS

HEAT WAVE DIAGRAM

EXAMPLES OF HEAT WAVES

• October 1924( Marble Bar)
• Lasted for 160
• Wasn't the hottest weather but lasted for a long period of time

EXAMPLES OF HEAT WAVES

• June 1958, London The Great Stink
• Extreme temperatures
• Cholera was spreading at the time
• Flushing toilets were invented casuing an increase in waste
• It rained and a new sewage system was made

HUMAN AFFECTS

• Burning fuels
• Cutting down trees
• Increase in temperature
• Increase in green house gases

SYMPTOMS OF HEAT WAVES

• Hyperthermia
• Heat Rash
• Heat Cramp
• Other small symptoms

SAFETY

• Stop activities or do them at different times
• Wear Summer Clothes
• Make sure to Drink a lot of fluids
• Keep your AC on

CONCLUSION

• Both of these disasters can be harardous
• Both have an increased chance of haplening because of humans
• They are both from different groups
• Both are dangerous and should be avoided
• Humans should stop polluting the environment