- 04/15/2019 at 12:32 am #480426EduGorillaKeymasterSelect Question Language :
Directions: In the following question, four statements are provided between an opening statement 1 and a closing statement 6. The four statements are jumbled up and form a coherent paragraph when properly arranged. Select the alternative representing the proper and logical sequencing of these six taken together.
1. In the early 1960's came the application of radiometric dating, the field that has rightly been called the 'oldest profession', to hominid evolution.
A. The intense heat of the eruption rests the 40K/40Ar ratio to zero because all of the Argon that has accumulated so far is released into the atmosphere.
B. When volcanoes erupt, magma from deep within the earth is poured out as lava or coughed up as ashes.
C. Radiometric dating is based on the steady rate of decay of radioactive isotopes into stable, daughter isotopes, such as the transformation of radioactive potassium – 40 (40K) to stable argon – 40(40Ar).
D. Thus, the amount of these isotopes in rocks formed by ancient volcanic eruptions indicates how much time has elapsed since that eruption.
6. Such dating tells us that Homo erectus was alive almost as many as 2 million years ago in Africa.
Post your Training /Course EnquiryAre You looking institutes / coaching center for
- IIT-JEE, NEET, CAT
- Bank PO, SSC, Railways
- Study Abroad