49
because
of
their
………………….,
they
act
as
rigid
………………….absorbing the energy of waves . The prolonging
slamming of waves against the hulls of these ships can cause serious
…………………in these large vessels.
8-Giant
waves
are
also
created
by
the
force
of
………………………..that flow ……………………….to the direction
of waves.
9-Waves
that
movr
horizontally
are
called
……………………like………………….waves that do not move are
called………………………….
10-As progressive waves , we have …………………………….and
…………….
11- ………………..waves occur under the surface of water.
12-…………………….is a series of seismic sea wave.
13-…………………….waves are slower than ………………..and can
be ………in size . Their periods are measured in………………
14-ocean swells are ……………….
15-………………………….is the transition layer between warmer
mixed water at the ocean surface and cooler deeper water below.
16-……………….is avertical zone in the oceanic water column in
which salinity changes rapidly with depth.
17-……………………is the boundary separating two liquid layers of
different densities.
18-The period of some internal waves………………………..the period
of tides.
19-the Japenese word Tsunami refers to……………………………..
20-Tsunami is a series of waves with ……………periods and
……………….wavelength , they travel ………….from their point of
origin at ……………..speeds.