Question

The _______ fragrance of soil after the first rain is always refreshing.

Answer 1

Hint: When rain falls on dry soil a scent is produced which is technically known as petrichor. This smell is caused due to secretion of oils by few plants.There are many other habitats involving water environments or animal bodies.

Complete Answer:
The earthy fragrance formed when rain falls on dry soil is technically termed as petrichor. Petrichor is usually caused due to the secretion of oils by few plants, the formation of the geosmin chemical by Actinomycetes bacteria, ozone, and also our higher sensitivity of nose to the scent of petrichor.
Actinomycetes are thread-similar bacteria that generally grow in warm and damp soil. Although, soil is their essential habitat. After a long time period of dry weather, the functionalities of actinomycetes in soil slow down. Just before the rain, when the soils become damp, actinomycetes start to awake and form a by-product known as geosmin that contributes to the "earthy smell."
Actinomycetes is very useful in playing an important role in soils by increasing the soil nutrients and improving the growth of plants. They are used in decomposing dead animals and plants, then enriching nutrients for plant growth. Further, they can also work with each other to control the growth of harmful soil bacteria in maintaining a sustainable soil environment.

So, The petrichor fragrance of soil after the first rain is always refreshing.

Additional Information:
Petrichor is a mixture of fragrant chemical compounds. Some of them are from oils formed by plants. The main contributors of petrichor are actinobacteria. These tiny microorganisms are usually found in rural and urban areas and also in marine environments. They are used in decomposing dead or decaying organic matter into simple chemical compounds that can further become nutrients for forming plants and other organisms.

Note: Dry soil of earth usually makes earthy smell after falling rain drops.When raindrops fall on the ground, mainly porous surfaces just like as loose soil or rough concrete, they will going to splatter and remove small particles known as aerosols. The fragrance usually runs away after the storm has passed and the ground begins to dry.