5. when the sea floor spreads apart, volcanoes and ridges are formed because - a. sediments are deposited where the floor spreads, building ridges b. as the plates pull apart, magma moves to the surface, building ridges c. ocean water pushes down on the surrounding sea floor, pushing up ridges d. underwater earthquakes lift the sea floor into long ridges

In a 2010 article “fact check: eastern u.s. earthquake risk” by chris mould, the author provides as evidence the following statement by the united states geological survey: “although earthquakes may be less frequent in the eastern u.s., … urban areas in the east could face bigger losses because the shaking would affect much larger areas than similar quakes in the west. in addition, most homes and buildings in the east are not designed to withstand earthquakes.”this statement directly relates to which of the following concepts? a. vulnerabilityb. hazardc. riskd. severity

[fw.02]diana is studying four surface features of florida. she classifies the surface features and places them in different columns of a chart as shown below. surface features column 1 column 2 hot springs sinkholes caverns geysers which of these titles best represents column 1 of diana's chart? formed by freezing groundwater o formed by heating groundwater o formed by evaporation of groundwater o formed by chemical action of groundwater

What first caused people to consider that the continents were once one large landmass?