1 Amphibians-Amphibians (class Amphibia) are a taxon of animals that include all tetrapods, four-legged vertebrates, that do not have amniotic eggs. 2  Fish-A fish is a water-dwelling vertebrate with gills. 3  Most are cold-blooded. 4  There are over 29,000 species of fish, making them the most diverse group of vertebrates.
The instrument used to measure earthquakes is called a seismometer, which measures the motions of the ground. The old term for this was a seismograph (where the equipment for measuring and plotting the data was combined unlike in the modern equipment where these functions are separate).
seismograph A seismograph, or seismometer, is an instrument used to detect and record earthquakes. Generally, it consists of a mass attached to a fixed base. During an earthquake, the base moves and the mass does not. The motion of the base with respect to the mass is commonly transformed into an electrical voltage. The electrical voltage is recorded on paper, magnetic tape, or another recording medium.