Sea salts, fine-soil, smoke and soot, pollen and microorganism, and volcanic ash are examples of particulate matter. These small particles in air can originate from natural sources or human activities. While they play a crucial role in ecological cycles, excess particulate matter due to pollution can damage ecosystems and built structures.
Sea salts from breaking waves, fine-soil blown into the air, smoke and soot from wildfires, pollen and microorganisms lifted by the wind, and ash from volcanic eruptions are all examples of particulate matter. These are small particles such as dust, dirt, viral particles, and bacteria that are present in the air. They can originate from both natural sources, like volcanic eruptions, and from human activities, like burning fossil fuels.
Particulate matter plays an essential role in various ecological processes. For instance, sulfur dioxide, a form of particulate matter, can become available to terrestrial and marine ecosystems when dissolved in precipitation or when it falls directly to Earth as fallout. This process contributes to the nutrient cycle, allowing decomposition of living organisms to return sulfates to the ocean, soil, and atmosphere.
However, excessive amounts of particulate matter, often resulting from pollution, disrupt natural cycles and can be harmful. Acid rain, which results from rainwater falling through sulfur dioxide gas, is a direct consequence of this. It can damage aquatic ecosystems and built structures, indicating the wide-ranging effects of these particles on our environment.
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b. False
The correct answer is True
Explanation:
Geography is the field that studies phenomena on Earth in terms of land and their features and by including the interaction of humans with space. Due to this, geographers use quantitative precise methods such as statistics, weather analysis, among others that require no interpretation or little interpretation along with a qualitative method such as observations that depend on the interpretation of the geographer. Despite this, in most cases, the interpretation of geographers depends on personal perceptions and perspective that is commonly related to specific disciplines or areas of the geography. According to this, it is true, a geographer's interpretation of events, people, and places is influenced by perceptions and perspectives.
The correct answer is - B. rainfall and chemical reaction.
The Great Buddha statue is under constant change and it is slowly but surely weathering bit by bit. The two biggest reasons for this are:
- The rainfall; the water from the rainfall is one of the biggest causes of weathering of the rocks, the water is known to decompose the rocks over time and the Great Buddha statue which is on an open space is not an exception of its influence.
- The chemical reactions; China has a huge problem with pollution. There's lots of pollutants in the air that are causing serious damage to most things, including the Great Buddha statue, and they contribute to quicker decomposing with their corrosive power and change in colour than anything else.
the crust and the upper mantle
the continental crust and the oceanic crust
the upper and lower mantle
2. Earth's thin, rocky outer layer is its _____.
core
mantle
outer core
crust
3. Earth's core is made of an alloy of _____.
iron and nickel
copper and iron
zinc and magnesium
iron and zinc