No it's not a reasonable conclusion. Correlation does not lead to causation. If two variables are linked, then they may affect one another or there may be another set of factors involved. There isn't enough info to know for sure. The fact that r = -0.7 is fairly close to r = -1 indicates there's moderately strong negative correlation, but I don't think it's strong enough in my opinion. More research is needed.
In short, the keyword "caused" as part of the claim is what makes it unreasonable. There is no way to know that not eating vegetables leads to high blood pressure. It may be true but again, more info is needed.
Answer:
Standard form states that it is the way of writing a small or large value easily.
As per the statement:
The volume of a cubic box is 10 to the 6 power cubic millimeters.
⇒
Then;
standard form for the volume of box is :
cubic millimeters.
Therefore, the standard form of volume of box is, 1,000,000 cubic millimeters.