Which major contribution did james hutton and sir charles lyell make to the field of geology.

a. the principle of uniformitarianism b. a new form of radiometric dating c. discovery of fossils in the la brea tar pits d. names of the time periods on the geologic time scale

The correct answer is A. The principle of uniformitarianism

Explanation:

Both James Hutton and Sir Charles Lyell were important geologists during the 18th century as they focused on understanding the composition of Earth, the universe and the way this has changed over time. Besides this, in this field, they contributed to the principle of uniformitarianism that states general laws and principles that exist nowadays on Earth and Universe, also operated in the past. In the case of James Hutton, his work was based on observations related to the formation of Earth as well as geological arguments. Similarly, Sir Charles Lyell supported this principle based on the history of Earth; also, he formally explained this principle through his book Principles of Geology in 1830.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.