While race is more associated with biological traits, like your skin color, facial features, hair, etc., ethnicity is more about cultural identities and background. For example, you can be of Hispanic ethnicity and be of Caucasian race.
As for your first question,
When created in non-volcanic areas, water becomes heated as it comes into contact with hot rocks within the earth's crust. Then the water will rise back up to create hot springs. The volcanic activity responsible for creating the hot springs<span> are caused by the moving </span>hot<span> spot, which is currently under </span>Yellowstone<span>.
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As for your second question,
Balneology is the practice of treating and preventing disease through the use of natural mineral hot springs<span> water. That's a use of hot springs.</span>
Answer:
46 billion light-years (14 billion parsecs), making the diameter of the observable universe about 93 billion light-years (28 billion parsecs).
Explanation:
Logic...
For example, use the food web of a savannah biome.
Let's say the hippos all disappeared. Because the hippos are prey for the tertiary predators like a hyena, the population of the predators would decrease while the population of the grass increased.
If the predators disappeared the preys' population would spiral out of control and all the primary producers like leaves and grass would become scarce. Additionally, the decomposing carcass of animals like dead predators and prey create food for microorganisms which make fertile soil; thus, causing the land to become barren.
