The Probability P (As a Decimal) That a Tsunami with Waves

question 18

Multiple Choice

The probability P (as a decimal) that a tsunami with waves over 15 feet high will NOT strike a beach community over a period of t years is given by the formula P = 0.93^t. What is the probability that someone living in the beach community for 20 years will NOT encounter a tsunami with waves 15 feet or higher?

• A)23.4%
• B)18.6%
• C)33.7%
• D)14.0%

---

Definitions:

Cross-Cutting Relations

The principle that a geologic unit or feature is older than a rock or feature that crosscuts it.

Igneous Intrusion

The process where magma from the Earth's mantle cuts through or intrudes into the Earth's crust, eventually cooling and solidifying to form igneous rock.

Cross-Cutting Relations

A principle in geology that an igneous intrusion or fault must be younger than the rocks it intrudes or displaces.

Superposition

A principle in geology that states in an undisturbed sequence of rocks, layers on the bottom are older than those above them.