Who is Mrs. Sparks and why does she care about what is taught in schools?

Two books are used to model tectonic plates

The system of checks and balances ensures that

It can be inferred that the dramatic increase in defense spending by germany was the result of. (a) attempts by great britain to take german colonies. ( b) fear of a two-front war against france and russia (c) the need to put down a communist rebellion (d) a competition with the allies to produce atomic weapons