Summary
Summary G1 - Changing Physical Environments
- Course
- Institution
Handwritten summary of the whole Year 12 Unit 1 changing physical environments. These notes have been done on the Volcanoes topic not the Coastal Landscapes topic.
[Show more]
Seller
Follow
isabelagheorghiu
Content preview
Physical landscapes -1. 3.1 - Tectonic processes and hazards
Crust = Low density rocks - Oceanic (basalt) 6km thick, Continental (granite) 70km thick
Mantle = upper is rigid, lower is molten
Core = Outer is molten, inner is solid metal at 5500°C
Ridge push =Diverging plate margins, upper mantle seeps out creating ridge, cools and slides
down ridge, repeats
Slab pull = Subduction zones, cold and dense plate sinks into mantle
Sea floor spreading = convection currents push plates apart, creating new crust
Continental drift = Ocean floor spreads so continents pushed apart
Conservative margin = plates moving alongside each other
Converging margin = plates move into each other
Diverging margin = plates move apart from each other
Richter scale = measures earthquake energy
Mercalli scale = measures earthquake effects
Volcanic Explosivity Index = strength of volcanic eruption
1.3.2 - Volcanoes, processes, hazards and their impacts
Mafic magma = basaltic, law viscosity, constructive boundaries and hotspots
Felsic magma = acidic, high viscosity
Effusive eruption = mafic magma, shield volcanoes
Explosive eruption = felsic magma, Strato and cinder and dome volcanoes
Stratovolcanoes = alternate layers of magma and pyroclastics, often dormant
Cinder volcanoes = small volume, small rock fragments piled up
Dome volcanoes = steep sides as lava cools quick and is very viscous
Shield volcanoes = gentle slopes, few pyroclastic materials
Primary hazards:
● Pyroclastic flows = high density mix of hot rock fragments and gases between 200°C
and 700°C
● Lava flows = streams of molten rock
● Ash fall = tiny, jagged pieces of rock and glass that are airborne
● Toxic gas =released from lava as it rises, denser than air so flow down mountainside and
gather in depressions
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller isabelagheorghiu. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $8.91. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
53022 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now