Aschool psychologist was concerned with the number of children being diagnosed with attention-deficit hyperactivity disorder (adhd). if she were interested in learning how many new cases of adhd had been diagnosed within the last two years, she will look at

The Diagnostic and Statistical Manual of Mental Disorders, in its fifth edition (or DSM 5).

Explanation:

This a manual created and published by the American Psychiatry Association, which is used by most of today's psychologists for diagnostic related inquiries on mental health disorders.

Last updated, DSM 5, was published in 2013, and it is still consider as useful when seeking for statistic information.

giant impact theory - the moon was formed from the collision between earth and another mars-sized body.

colliding planetesimals hypothesis - the moon was formed from the same cloud of material as earth.

capture hypothesis - the moon was locked into orbit by earths gravity as it was passing by it.

accretion hypothesis - the moon was formed from collisions and combining of planetesimals.

i think this is right, if not and you know better let me know.

the density would be a smaller number.