### person | explorer | diver:

Cave diver
* Most cave divers explore regions
  - western regions
* use line arrows to mark the direction of the closest exit.

Human diver
* use compressed air and constantly absorb extra nitrogen when submerged.
* wear rubber ones.

### person | explorer:

Scuba diver
* Most scuba divers come to surfaces
  - see shells
* Most scuba divers wear suits
  - wet suits
* are divers
  - fully and completely responsible for themselves and their equipment
  - located in water
* can communicate underwater
  - dive among the numerous wrecks in the Upper Peninsula's five underwater preserves
  - explore the offshore wrecks and reefs
  - hear the singing if they hold their breath and pay attention
  - practically jump out of their cars into the water
  - see the abundance of life found in and around the rocky shoreline
* change out a current meter used to monitor currents in the Bahamas.
* explore vivid underwater sea life at the bottom of the ocean.
* is an explorer
* love the clear ocean waters and the chance to see a number of shipwrecks.
* prowl old wrecks and precipitous reefs.
* pursue their sport to experience the fun and excitement of the underwater world.
* see huge cliffs, boulders, overhangs, and rock walls
* use a tank of air, strapped on their bodies
  - checklists before going into the water

Speleologist
* have good hunting grounds in the limestone formations of Andalucia.
* is an explorer
* use many special contrivances and methods in exploring caves.

Spelunker
* are at risk of infection
  - hobbyists
+ Caving, Spelunkers and their equipment: Hobbies :: Caves
  * Spelunkers tie their ropes with different kinds of knots, like the 'farmer's hitch knot' and the 'alpine butterfly knot'. Spelunkers choose different knots for different purposes. Some knots work well to hold people as they climb. Other knots are best for tying ropes together.

### person:

Extravert
* are more active sexually, in terms of frequency and different partners, than introverts
  - people who get energy from the outside world
* enjoy interacting with people, and are often perceived as full of energy.
* find energy in things and people.
* have lower levels of arousal than introverts for the same stimulus.
* like to be out in the world, serving, ministering, expounding, and acting on their faith
  - spend their time with other people
+ Myers-Briggs Type Indicator, Outlooks (Introversion / Extraversion): Psychology
  * The MBTI measures four things. Extraverts are people who get energy from the outside world. Extraverts like to spend their time with other people. Introverts are people who get energy from the inside world. Introverts tend to get energy from thinking and reflecting.

### person:

Extrovert
* are gregarious, socially active, and sensation seeking
  - the type of people who are outgoing and loud
* do better in high-density communities than do introverts.
* enjoy being with people, are full of energy, and often experience positive emotions.
* generally derive energy from others, while introverts do so from within.
* love parties, especially when they can talk with everyone present.
* marry introverts.
* prefer sports like football and rugby because they involve team work and hard work.
* tend to feel comfortable in social situations and tend to be gregarious.
* work more outside in and introverts work more inside out.