Astronomers using new space-based telescopes have found over a thousand exoplanets of all different types. some of these are in the habitable zone around their parent star. what can we expect to find on these planets

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

Which of the following statements is true? a. there is not enough food produced in the world to feed everyone. b. the biggest cause of hunger and malnutrition is the cost of getting food to people who need it most. c. most countries have enough arable land and resources to feed their own population and export a surplus d. malnourishment is only seen in a few countries with very limited food supplies.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4