Question

sample b: earth rocks dated using uranium - 238
number of half lives\tage (in millions of years)
1.0069\t2858
1.0096\t2872
1.0176\t3301
based on the data, what conclusions can you draw about sample a compared to sample b?
which rocks formed first: sample a or sample b?
how do you know: what evidence supports your answer?
write your answer as complete sentences for full points (capital, period, proper spelling/grammar). copy/paste from the internet is an automatic zero. audio recording can also be submitted.
grading:
1/2 point - complete sentence(s)
1/2 point - identifying which rocks formed first
1 point - evidence/data that explains your answer

Explanation:

To determine which rocks formed first, we look at the age data. Older rocks formed first. Since no data for Sample A is provided, assuming we are only comparing the ages within Sample B data, the rock with the greatest age among these in Sample B formed first. Among the ages given (2858, 2872, 3301 million years), the rock with an age of 3301 million years is the oldest.

Answer:

In Sample B, the rock with an age of 3301 million years formed first. Since no data for Sample A is given, we cannot compare Sample A and Sample B. The evidence is the age - data in the table where 3301 million years is the greatest age among the provided values for Sample B.