A longitudinal wave occurs when the disturbance moves in the same direction as the wave itself. Sound is an example of a longitudinal wave. A compression is where the particles of the medium are closest together, and a rarefaction is where the particles are farthest apart.
Answer:
ponds cooler than 20 °C
Explanation:
There is great effect of temperature on the dissolved oxygen in a pond water,
When the water is hotter it will hold less oxygen but when the water is cold it will holds more oxygen. Therefore, ponds cooler than 20 °C will will have a higher average oxygen concentration.
Answer:
Bergeron process
Explanation:
This is a process when precipitate is formed in mixed cloud of temperature below freezing because equilibrium pressure of water vapour with respect to ice is less compared to that of liquid water.
Cracks in rocks : mechanical
Lichen growing on rocks : chemical
Roots or plant growth making cracks in the concrete : mechanical
Worn away statues : chemical and mechanical in my opinion
Exposed rocks : mechanical
Rust on rocks : chemical
Answer:
Option (1)
Explanation:
Clay is the most porous but least permeable rock.
The porosity is defined as the property of the rock that allows the water to store in its pore spaces. In simple words, it is the measure of the pore spaces that are present in the rock. Whereas the permeability is the property that allows the fluid to pass through the cracks of the rocks and mixing up with the groundwater.
So, in the case of clay, the inter-granular spaces (pore spaces) between the rocks help in trapping the water in them, but they do not allow the water to transmit and get mix up with the groundwater. So, they are the best example of porous rocks.
Hence, the correct answer is option (1).
