My definition of language fluency. Fluency is a spectrum (see the video below). This is my primary criteria for determining a personâs fluency level in a foreign language: Theyâre able to use their target language to learn more target language.
Geophysics /dÊiËoÊfÉªzÉªks/ is a subject of natural science concerned with the physical processes and physical properties of the Earth and its surrounding space environment, and the use of quantitative methods for their analysis.
Geophysics emerged as a separate discipline only in the 19th century, from the intersection of physical geography, geology, astronomy, meteorology, and physics. However, many geophysical phenomena â such as the Earth's magnetic field and earthquakes â have been investigated since the ancient era.