Please help What rock layer marks the end of the dinosaurs?

Question 1 options:

Burgess Shale layer

Mesozoic Layer

KT Boundary layer

How do scientists think that gravity affected the formation of our solar system?

Describing intermolecular forces use the drop down menus to match the type of intermolecular force to its name dipole dipole interactions dipole induced dipole interactions london dispersion forces hydrogen bond van der waals forces done

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel