Astalemate is a situation in which further action is blocked. a stalemate during world war i was broken in 1917 by
a.
american entry into the war.
b.
the use of chemical weapons.
c.
the invasion of normandy.
d.
a significant german naval victory.

 The correct answer is :  b.  hydrothermal vents

Explanation:  A hydrothermal vent is a fissure at the bottom of the sea from which geothermally heated water flows. These vents are generally located near volcanically active places, also in places where tectonic plates are separating. Alvin is a deep immersion vehicle of the Woods Hole Oceanographic Institution.