The remnants of prehistoric plants and animals that were buried by rock and sediments and eventually turned into natural gas, oil, and coal are .

Fossil fuels

Explanation:

Fossils are the remnants of the ancient plants and animals that were buried thousands and millions of years back. These fossils over a large geological time were subjected to the high pressure and temperature conditions, and are found to be embedded in the sedimentary rocks.

These fossil fuels are highly essential for use, but they are considered to be non-renewable resources as it takes a large amount of time for formation. The use of these fossil fuels must be reduced as it releases a high amount of carbon that is harmful to the environment.

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.

geologic time scale (for gradpoint) =)