The name concrete operations describes how children (A) handle materials to solve problems.
(B) use what they have experienced to solve problems.
(C) reason abstractly to solve problems.
(D) develop hypotheses.

What is the order of the moon, earth, and sun in a lunar eclipse and a solar eclipse?

A1000-kg weather rocket is launched straight up. the rocket motor provides a constant acceleration for 16-s, then the motor stops. the rocket altitude 20-s after launch is 510-m. you can ignore any effects of air resistance. a. what was the rocket’s acceleration during the first 16-s? b. what is the rocket’s speed as it passes through a cloud 5100-m above the ground?

This is the substance(s) formed in a chemical reaction.