What’s a new discovery that makes it easier to use biomass as an energy source?

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

Which set of characteristics best describes igneous rock? a) largest type of rock, made of organic matter, hardest type of rock b) least abundant type of rock, made of other rocks, made mostly of minerals c) found on all continents, contains wavy bands of stripes, contains fossils d) most abundant type in earth's crust, made of magma/lava, contains no fossils

What type of reaction fuels the processes seen here?