Answer:
potassium-argon dating
Explanation:
Potassium-argon (K-Ar) dating technique is the most appropriate dating method for establishing the age of a volcanic ash. It is most applicable for dating minerals and rocks more than 100,000 years old. It is based on measuring the product of the radioactive decay of an isotope of potassium (k) into argon (Ar). Since potassium is a common element found in many volcanic ash layer, the time since re-crystallization is calculated by measuring the ratio of the amount of argon 40 (Ar-40) accumulated to the amount of potassium 40 (K-40) remaining in these volcanic ashes.
I believe the answer is D :)
the exxon valdez oil spill occurred in Alaska.
The answer is B.) Physical Geography
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Answer:
The GIS is a very important mapmaking tool for geographers.
Explanation:
- A geographical information system is a system to capture, store data that is used for further processing and it displays different types of map layer, raster, and vector data forms, and various data sets, frames, and metadata, etc.
- Colors represent symbolism and areas in red color represent vegetation as seen in false color.
- Dot density is represented by the map scale and it shows the number of dots for distribution of population in the area.
- Zooming in and out of the map layer changes area showing on the map as it becomes a large scale for a small scale and visa versa hence it affects the information shown on the map.
- Zooming in on the manhattan Islands we can see cities and major roads more clearly and it gives us more details.
- There are areas in and around manhattan that have a lower density of the population of which belong to the senior residents and are at the Washington heights, and hamilton heights.