A standing wave oscillates about a(n) ____________, a location at ...

[HCHenry]

A standing wave oscillates about a(n) ____________, a location at which there is no vertical movement. Fill in the blank(s) with the appropriate word(s).

Question 2

Sub-surface waves that form at the boundary between water layers of different densities are ____________
  ____________. Fill in the blank(s) with the appropriate word(s).

[yotaSR5]

Answer to Question 1

node

Answer to Question 2

internal waves

[HCHenry]

TYSM

[dyrone]

Thanks for the timely response, appreciate it