Question

question 1
briefly explain the causes of glaciation and the processes that cause glaciers to grow.
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question 2
briefly explain how changes in sea level and evidence of past marine life are related.
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question 3
describe how life was affected on earth during the cretaceous period when an asteroid struck the yucatán peninsula in mexico.

Explanation:

Question 1: Glaciation is mainly caused by long - term climate cooling, often due to changes in Earth's orbit (Milankovitch cycles), solar radiation variations and volcanic activity that can block sunlight. Glaciers grow when more snow accumulates in winter than melts in summer. Snow compresses into ice over time, adding to the glacier's mass.
Question 2: Changes in sea level can expose or submerge areas. Fossils of past marine life are often found in areas that were once underwater. Rising sea levels can cover areas with new sediment, preserving marine fossils. Falling sea levels can expose old seabeds with fossil evidence, showing where marine life once existed.
Question 3: The asteroid impact during the Cretaceous Period caused massive wildfires from the heat of the impact. It threw up huge amounts of dust and debris into the atmosphere, blocking sunlight and causing a "nuclear winter" - like effect. This led to a drop in global temperatures, disrupted photosynthesis, and caused the extinction of many species, including the non - avian dinosaurs.

Answer:

Question 1: Glaciation is caused by long - term climate cooling from orbital changes, solar variations, etc. Glaciers grow when snow accumulation exceeds melting.
Question 2: Sea - level changes expose or submerge areas, and fossils of past marine life are found in areas that were once underwater. Rising sea levels can preserve fossils, falling ones expose them.
Question 3: The asteroid impact caused wildfires, blocked sunlight, led to a temperature drop, disrupted photosynthesis and caused mass extinctions including non - avian dinosaurs.