What are the measures that countries take to prevent the entry of illegal migrants into their States?

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

What type of government does costa rica have?

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.