The Time and Date of the Last Megathrust Earthquake on the Cascadia

question 15

Multiple Choice

The time and date of the last megathrust earthquake on the Cascadia Subduction Zone has been deduced from _______________.

• A) dating of coastal trees killed by seawater after sudden subsidence
• B) Japanese tsunami records
• C) seismograph recordings
• D) all of these are correct
• E) dating of coastal trees killed by seawater after sudden subsidence and Japanese tsunami records

---

Definitions:

Adaptive Immune Response

The body's immune system's ability to recognize and specifically react to pathogens through the activation of lymphocytes, providing long-lasting protection.

Active Immunity

Immunity that develops as a result of exposure to antigens; it can occur naturally after recovery from a disease or can be artificially induced by immunization with a vaccine. Compare with passive immunity.

Passive Immunity

Temporary immunity that depends on the presence of immunoglobulins produced by another organism. Compare with active immunity.

B Cells

A type of white blood cell that plays a crucial role in the body's immune response by producing antibodies.