Susana heats up a sample of red crystals. While the
sample is being heated, a gas is released and a blue
powder is left after the heating. Is the sample of red
crystals an element or a compound?

Which of the following was an economic reason for the united states to declare war on spain in 1898?

8y=-6x+24 whats the slope and y-intercept

In the years after world war ii, which of the following caused many people from asian and african countries to migrate to europe? a. the end of the soviet union b. new economic opportunities after colonialism ended c. the religious freedom found in europe d. new laws allowing greater numbers of immigrants into european countries