The half-life of an element is important for determining the _______ of a rock.
A. relative age
B. absolute age
C. mineral makeup
D. decomposition rate
Is it B??
Which one of the following is not left in the land as a result of continental glaciers?
A. Eskers
B. Loess
C. Drumlins
D. Erratics
is it A?
I agree with 1 as B.
I don't think A is right for 2; look up the definition of each. A, C, and D definitions talk about glaciers; B does not.
i believe number 2 is D. erractics
For the first question, the correct answer is B. The half-life of an element is important for determining the absolute age of a rock.
To understand why, it is essential to know what half-life means. The half-life of an element is the amount of time it takes for half of the radioactive atoms in a sample to decay or break down. In the context of rocks, radioactive isotopes present in certain minerals can help determine the age of the rock through radiometric dating.
Radiometric dating involves measuring the ratio of the parent isotopes (the original radioactive element) to the daughter isotopes (the decayed or transformed element) in a rock sample. By knowing the half-life of the radioactive element, scientists can calculate how long it took for the rock to accumulate the amount of daughter isotopes observed. Therefore, the half-life provides a crucial piece of information for determining the absolute age of a rock.
Moving on to the second question, the correct answer is D. Erratics are not left in the land as a result of continental glaciers.
During the glacial periods, continental glaciers can have significant effects on the landscape. They can transport and deposit various materials as they move and melt. Three examples of landforms left by continental glaciers are:
A. Eskers: These are winding ridges of gravel and sand that form within, on top of, or along the sides of glaciers. They are created when meltwater flows through tunnels or channels in the ice and deposits sediment as the glacier retreats.
B. Loess: This refers to a type of wind-blown sediment made up of fine particles, typically silt-sized. Loess deposits are often associated with areas that were covered by glaciers as the wind carries the particles for long distances and then deposits them once the wind loses energy.
C. Drumlins: Drumlins are elongated hills or mounds of sediment that have a steep side (the stoss side) and a gentler, tapered side (the lee side). They form as glaciers move over land, reshaping and depositing sediment in the process.
D. Erratics: Unlike the other options, erratics are not left in the land as a result of continental glaciers. Erratics are rocks that are different from the surrounding bedrock and were transported and deposited by glaciers from a far-off location. These rocks can vary in size and composition and are typically left behind when the glacier retreats or melts.
Therefore, the correct answer to the second question is D. Erratics are not left in the land as a result of continental glaciers.