Answer:
B. Aerobic bottom water
D. High organic productivity in the overlying oxygen rich water
Explanation:
A Shale is a sedimentary rock usually formed from silt and clay-size mineral. There are different colors of Shale. The Black Shale is formed under anaerobic conditions. This means that oxygen is deficient in the water where the Shale forms.
A little amount of organic materials is required for the formation of Black Shale and because Black Shale is formed in an environment lacking oxygen, an oxygen-rich water would not be necessary for its growth. Sediments are necessary in the formation of Black Shale.
<u>Answer:</u>
D. Preventing people from visiting wildfire-prone areas
This would cause the greatest reduction of wildfires
<u>Explanation:</u>
Anthropogenic activities are the main source for forest fires. Humans intentionally or unintentionally became the reason for forest fires than lightning, rainfall deficit, and wind speed. Forest people responsible for causing fires because of shifting cultivation and livelihoods. Sub tropical forest were fired for cattle rearing becuase dense forests are not fit for cattle rearing. Increase in lightning storm also causes the forest fire. Decrease in rainfall leads to forest fire in Equator and tropical regions because of high temperature and high wind speed.
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.
It is true, countries like Kosovo and Bosnia-Herzegovina can be put under this category despite not having a coastline on the Mediterranean.
