Actually NASA never sent a spacecraft through the asteroid belt because it was to risky, instead they sent it around the other way of Jupiter.
Answer: From Piaget's theory of cognitive development, The concept of Object Permanence.
Explanation:Object Permanence, for the baby means that he is starting to understand that things can disappear although they aren't gone forever.
Since Jonathan's mom left him he began to cry because he did not want her to leave although he knows she won't be gone forever.
Mount Vernon estate.......
North America….. It is the northern america
Answer: Productive most commonly means: achieving or producing a significant amount or result.
Explanation:
productive can also mean:
producing or giving rise torelating to or engaged in the production of goods, crops, or other commodities.
these depend on how the word productive is used. most likely productive will mean achieving or producing a significant amount or result.