The layers of earth are based on what two sets of characteristics?

Orion the hunter is known for two navigational stars. which pair of stars are they?

What does a movement along the demand curve show

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