We believe that all of the terrestrial planets had similar histories when it comes to impacts from space. explain how this idea can be used to date the formation of the martian highlands, the martian basins, and the tharsis volcanoes. how certain are the ages derived for these features (in other words, how do we check the ages we derive from this method)?

show the wavelengths of a wave. show the crests of a wave.

see earlier

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia