1
.
A
____________________
is
an
idea
that
tries
to
explain
something
.
2
.
____________________
are
events
that
are
hard
to
explain
.
3
.
A
____________________
is
a
person
who
studies
a
subject
in
detail
.
4
.
A
____________________
is
a
small
tool
or
machine
that
helps
you
do
something
.
