Answer:
B. one fourth of the original substance
Explanation:
a substance's half life is how long it takes for half of the atoms in the substance to chemically decompose. once it's half life has been completed, it will start again with the remaining material. after 6000 years, only half of the material will remain, after 12,000 years a quarter wil remain, after 18,000 years an eighth will remain, etc.
The satellite that was used to produce the sea floor maps in this year was the Geosat.
<h3>What is the Geosat?</h3>
The Geosat is a United States Navy satellite that was used to produce these maps in this year.
The Geosat was launched in the year 1985 into the inclination orbit. It is helpful in the measurement of sea surface heights to about 5cm.
Read more on Geosat here: brainly.com/question/18496962
Gabilan mountains are a range of mountains in the inner California coast ranges system.
Answer:
Geographic Information systems
Explanation:
Geographic information systems also known as GIS is used in collecting, storing, manipulating, analyzing geographic and spatial data.
GIS is core and very essential to making geographically oriented decisions. The system works more like a statistical set up but with a touch and edge of being able to handle geographic data perfectly well. This provides a new dimension for business, government etc to make decisions that would serve the need of all.
How it is used:
GIS is made up of different components which helps to make it very unique and special. The system consists of hardware, software and the people ware.
Attributes of features are collected with respect to a study. Their location are also included in the sampling. The software environment which can be a system application or web based one helps to manipulate the data in the best way to produce a fitting result.