10
b-are made of the ash of volcanoes.
c- are made of small particles of rocks.
12-Hydrogenous sediments : a- are particles that come from space.
b-are particles that form by chemical and biochemical reactions in
seawater.
c-are particles that come from land.
13-volcanogenous sediments : a-are ejected from volcanoes.
b-are carried by rivers to the ocean.
c-are made of shells and skeletons of dead organisms.
14-wind and currents contribute to the dispersal of sediments in the
ocean :
a- True.
b- B- false.
15-the hydrologic cycle contribute to the deposit of sediments in the
ocean : a- true.
b-false.
16-in order to know what is the nature of sediment deposit in a
particular area :
a-we have to examine the composition of sediments.
b-we have to examine the chemical composition of seawater.
17-the strength of wind and currents also contributes to the distribution
of sediments in the ocean : a-true.
c- False.
18-currents sort particles of rocks and sand and disperse them
according to:
a-their weight.
b-their chemical composition.