Question

They rode on horseback from Asta6. Why did sea levels begin to rise 20,000 years ago? Where did the water come from?

a) Melting glaciers and ice sheets contributed to rising sea levels; water came from the polar ice caps.
b) Volcanic activity increased, releasing water from underground reservoirs into the oceans.
c) Large-scale deforestation led to excess water runoff into the seas, causing a rise in sea levels.
d) Sea levels remained constant 20,000 years ago; there was no significant rise during that period.

Answer 1

Option A.

Sea levels rose 20,000 years ago due to melting glaciers and ice sheets, which is linked to climate change and thermal expansion.

Step-by-step explanation:

Sea levels began to rise 20,000 years ago primarily due to melting glaciers and ice sheets. As the global temperature increased, glaciers and ice caps started melting, adding more water to the oceans.

Not only did the melting contribute to the rising sea levels, but the phenomenon of thermal expansion also played a role. As ocean water warms, it expands and occupies more space, further increasing sea levels. Both of these processes are linked to climate change.

Past data indicate significant fluctuations in sea levels, with a notable increase in sea level rise observed over recent decades.

Final answer in 20 words: The correct option is a) Melting glaciers and ice sheets contributed to rising sea levels; water came from the polar ice caps.