Which principle or law of geology states that in a sequence of undeformed sedimentary rocks, each bed is older than the one above?

The law of superposition related to the strata in geology (also called Steno's Law) states that "sediment layers are deposited in a temporal sequence, in which the oldest are in a position inferior to the most recent"

This principle was initially proposed in the 11th century by the Persian geologist Ibn Sina, and was first proposed as a law in the 17th century by the Danish scientist Nicolás Steno.

a maximum–minimum thermometer. the scales are fahrenheit on the inside of the u and celsius on the outside. the current temperature is 23 degrees celsius, the maximum recorded is 25, and the minimum is 15, both read from the base of the small markers in each arm of the u tube. the bulbs are hidden by a plastic housing.

six's thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. it is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. it was invented by a british scientist james six, born in canterbury, in 1780; [1] the same basic design remains in use.

it is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design.

the thermometer indicates the current temperature, and the highest and lowest temperatures since last reset.

because the center-south is called the heart of the country