### substance | latex | rubber:

Natural rubber
* Most natural rubber comes from latex
  - is produced in Africa and South Asia
* Some natural rubber absorbs heat.
* deteriorates over time and all blade materials fall victim to environmental factors.
* good example of biomaterials that can compete directly with petrochemicals.
* has a large deformability capacity.
* have many of the charac-teristics required in an effective seal.
* is also a polymer of a molecule known as isoprene
  - an elastomer and a thermoplastic
  - brittle when cold and sticky when warm
  - effective only for dry formulations
  - extracted from Hevea brasiliensis
  - made into natural rubber latex through a manufacturing process
* is one of the most elastic substances known
  - widely used of all plant products
  - siphoned from cultivated trees on plantations in Asia and Africa
  - superior in resilience to synthetics
* is the best for airplane tires and is also important in radial tires
  - raw material for ebonite
  - their primary raw material
  - used by many manufacturing companies for the production of rubber products
* is, naturally a natural polymer also, made from just carbon and hydrogen.
* latex exudate of certain trees and composed of monomers called isoprene units.
* offers reasonable abrasion resistance.
* polymer of isoprene, and is both a thermoplastic and an elastomer.
* processed product of latex.
* provides abrasion resistance.
* relatively poor air retainer.

Rubber cement
* is adhesive
  - also extremely flammable
  - highly flammable and explosive and was set off by sparking inside
* very convenient adhesive for pasting graphic elements.

Silicone rubber
* is synthetic rubber
  - used for small scale casting
* synthetic polymer similar in chemical composition to quartz.

Vulcanized rubber
* has many properties that make it useful.
* is hard to recycle
  - stronger yet also more elastic than the starting material
* represents the first commercially successful product of polymer research.

Synthetic latex
* Most synthetic latex includes natural rubber
* is used as an alternative for latex sensitive individuals.

### substance | lava:

Basaltic lava
* has a low viscosity and often flows for long distances from the eruption site
  - relatively low viscosity, so flows move far and fast
* is dark because it contains high amounts of iron and magnesium
  - one type of magma

Basaltic lavas
* are runnier, like maple syrup, while rhyolitic lavas are more like molasses.
* have low viscosities.

### substance | lava:

Blocky lava
* makes piles of sharp chunks.
+ Lava, Types of lava, Blocky lava
  * Blocky lava usually  out from a volcano only after an explosion has let out lots of the gas pressure from the place where there is magma. Blocky lava makes  piles of sharp chunks.
+ Lava: Volcanology
  * Lava' is magma that flows onto the Earth's surface. Blocky lava is so thick and slow that it barely moves along the ground. Other types of lava, like 'pahoehoe', 'aa', and 'pillow lava', are thinner and flow faster.

Hawaiian lava
* contains much iron and can form magnetic minerals.
* flows into the sea.

Molten lava
* flows through tubes from the vent to the ocean.
* is usually orange or red.
* seeps into surrounding crust.