How are eras and periods of the geologic time scale named? a) They are named for the places where geologists first described roc
ks or fossils from that time. b) Their names are based on the names of scientists who discovered the rocks and fossils. c) They are named after plants and animals that lived during that time. d) Their names are based on the number of centuries within that length of time.
A) They are named for the places where geologists first described rocks or fossils from that time
Explanation:
The relationship between plant and animals, layers and types of rocks, fossils and radioactive dating are used for preparing Geologic Time Scale. Geologic time is comprise of four Eons namely Hadean (the initial stage) followed by Archean and Proterozoic and Phanerozoic in the recent . The Eons are classified into eras and theses eras reflect the changes in fossil record. Eras are further divided into periods and some periods into Epochs.
In periods a single rock system is found while the division in the era's reflect major changes in fossil record.
The Industrial Revolution was the transition to new manufacturing processes in Europe and the United States, in the period from between 1760 to 1820 and 1840.
The act was initiated by Congressman Ronald V. Dellums in reaction to the plight of blacks in South Africa and demanded the end of apartheid. The legislation aimed to ban all new U.S. trade and investment in South Africa and would be a catalyst for similar sanctions in Europe and Japan.
Red Scare Impact The Red Scare was hysteria over the perceived threat posed by Communists in the U.S. during the Cold War between the Soviet Union and the United States, which intensified in the late 1940s and early 1950s. (Communists were often referred to as “Reds” for their allegiance to the red Soviet flag.)