Select the event that marks the beginning of the instrumental period of climate history.

Incomplete question. The options read;

a) routine and widespread usage of thermometers starting in 1860

b) invention of the mercury thermometer by Daniel Fahrenheit in 1714

c) first temperature recording by an orbiting weather satellite in 1979

d) use of ocean-going vessels to measure marine air temperatures in 2000

b) invention of the mercury thermometer by Daniel Fahrenheit in 1714

Explanation:

The definition of climate would lack proper understanding if not for the invention by Daniel Fahrenheit in 1714. Historians agree that Daniel's mercury thermometer allowed many other researchers to understand how much temperature existed in a particular environment or climate.

d. groundwater flows through the subsoil and deposits minerals.