Subject: We. Verb: Will Relocate.
Pleasem add more details fo this question
The underlined phrase <em>in the pool </em>modifies, or refers to the word A. chlorine.
What is in the pool water? The chlorine.
the first phrase is in the past tense, the second is in the present tense. Depending on the context, either can be used.
The factual details te author includes are:
-It fell to earth at approximately 3:15 p.m. on June 12, 2014.
-NASA scientis concluded that the spherical metal object was likely part of a spacecraft that survived reentry.