### graph:

Line graph
* are probably the most commonly used type of graph in scientific writing
  - the simplest graph to construct and use
* are used for displaying a single measured variable against a series of known quantities
  - to track changes over short and long periods of time
* depict the relationship between quantitative variables.
* special graph that is very commonly used in statistics.

Pie graph
* are a very familiar form of diagram, often used to help compare relative magnitudes.
* uses a circle divided into sections to display data.

Seismogram
* All seismograms are vertical component of ground motion.
* Every seismogram has a spectrum.
* are graphs
  - the primary data in seismology

### grass roots organizations:

Conservation district
* Most conservation districts are state agencies.
* are grass roots organizations
  - legal subdivisions of state government
  - political subdivisions of the State of Arkansas

### grave markers:

Small dot
* are grave markers.
* forms light tones, large dots form darker tones.

Gravestone
* are also kinds of stelae
  - memorials
  - part of graves
  - stones
* includes bases
* sometimes show where a person was born.
* usually contain the date of birth and death.
+ Stele, History and function: Archaeology :: Art
  * An obelisk is a specialized kind of stele. The Celtic high crosses of Ireland, Scotland, and Wales are 'specialized stelae'. Likewise, the totem pole of North and South America is a type of stelae. Gravestones are also kinds of stelae.

### gray crystalline solid:

Lead telluride
* gray crystalline solid.
* is used in another type of infrared sensor.
+ Lead telluride, Properties: Tellurium compounds
  * Lead telluride is a gray crystalline solid. It reacts with strong acids to make toxic hydrogen telluride and toxic lead salts.
+ Tellurium, Uses: Semimetals
  * Tellurium is also used in cadmium telluride solar cells. These are very efficient. It can be alloyed with both cadmium and mercury to make mercury cadmium telluride, an infrared sensitive semiconductor. Lead telluride is used in another type of infrared sensor.

### gray solid:

Gallium arsenide
* are chemical compounds.
* can replace silicon in the manufacture of linear ICs and digital ICs
  - substitute for indium phosphide in solar cells and semiconductor applications
* gray solid.
* has many of the properties of a semiconductor
  - much greater mobility than silicon
  - one big advantage over silicon, another element used in transistors
  - the ability to convert an electrical current directly into light
* is by no means a new technology and highly competitive business
  - capable of converting electricity directly into coherent light
  - more efficient
  - notably tougher and more efficient
  - the semiconductor most commonly used
* is used as a laser material that changes electricity directly into light
  - to convert electricity directly into coherent light
  - in a variety of optoelectronic infrared devices
* is used in lasers that convert electricity into coherent light
  - which convert electricity into coherent light
  - the production of transistors
* is used to convert electricity into coherent light
  - produce ultra-brite blue LEDs
* offers comparable hole mobility, but lower breakdown fields.
* produces less heat.
+ Gallium arsenide, Properties: Arsenic compounds
  * Gallium arsenide is a gray solid. It makes crystals in a cube shape. It reacts slowly with water and quickly with acids to make arsine. It oxidizes in air.