The event was volcanic eruption.
The second largest volcanic eruption took place in June 1991. The volcanic eruption took place in the Mount Pinatubo (a chain of volcanoes along the Luzon arc) on the island of Luzon in the Philippines. After the millions of tons of sulfur dioxide were discharged into the atmosphere, resulting in a decrease in the temperature worldwide over the next few year.
Answer:
Genotype Rr gives a round phenotype
Genotype rr gives a wrinkled phenotype
There will be 50% round plants and 50% wrinkled plants.
Explanation:
R r
r Rr rr
r Rr rr
Chromosomes and autosomal or somatic cells
1 AU is 149597871 kilometers.

We solve

This gives us .3897114284... AU away from the sun.
Answer: No in the sense that a material must maintain an identical chemical makeup and then change from one phase to another, not all solids have a melting point.
Explanation: Hope this helped! :)