Which type of rock is the farthest away from heat sources under the earth, in other words, heat is not involved with its formation
a: igneous
b: magma and lave
c: metamorphic
d: sedimentary

The ozone hole is at its biggest each year in the ? hemisphere in the ? season.

Which of the following best describes the purpose of a nation’s boundaries? a. to limit the movement of goods and people b. to make it easier for cartographers to create maps c. to make the movement of goods and people easier d. to prevent other countries from invading territory

The dashed segment of the plotted experiment in the graph in the lesson is called an