Explanation:
Because people who answer first tend to rush their answers and not do a clear explanation, they often get less recognition than the second person, who usually puts more effort into their answer. The example you gave is an example for that, as the second person has an explanation and more words.
A slow
b very viscous (viscosity is the thickness)
c no
d effusive eruption SHIELD VOLCANO
The answer is Permian-Triassic extinction.
The Permian-Triassic extinction was 252 million years ago. It is known as The Great Dying because about 95% of all species died out due to environmental changes (volcanic eruptions, dry climate, melting of ice sheets, etc). This is also the only event in which many insect species wiped out.