sentences: heat land has top light matter
docs: mercury_fulminate is high_explosive. landmass is large_area_of_land. groundmass is igneous_rock. illuminant is fuel. high_ground is site. sun's_light is what_heats_earth. high_plasticity_soil_region is fine_grained_soil_region. exotic_matter has negative_energy large_body_of_water is spatial_thing.