The Cause of the P-Wave Shadow Zone Includes

question 33

Multiple Choice

The cause of the P-wave shadow zone includes:

• A)P-waves are converted to S-waves,which cannot travel through the core
• B)some P-waves are refracted upward before they reach this zone
• C)some P-waves are refracted inward into the core,through which they cannot travel
• D)the P-waves travel curved paths and are prevented from reaching the core-mantle boundary
• E)all of these

---

Definitions:

Infundibulum

A funnel-shaped structure; it can refer to parts of the brain (infundibulum of the pituitary gland) or other organs.

Isthmus

A narrow strip of land with sea on either side, forming a link between two larger areas of land.

Ostium

An anatomical term denoting an opening or orifice, often into a hollow organ or structure.

Fimbriae

Tiny, hair-like projections on the surface of some cells, involved in attachment and movement.