In ΔQRS, the measure of ∠S=90°, the measure of ∠R=18°, and RS = 25 feet. Find the length of QR to the nearest tenth of a foot.

Match the vocabulary word with its meaning

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?