How do scientist determine where an earthquake starts?

They use seismology

Explanation:

Seismology is the study of seismic shocks (earthquakes), in order to understand and determine the mechanisms involved in the plate tectonics of our planet, as well as their causes and distribution over the terrestrial globe, in an attempt to predict them in time and space at from the analysis of circumstances in which natural earthquakes occur. As a method of geophysical study, seismology also performs analyzes on the structure and layers of the Earth, from its surface to the nucleus.

Through seismology, seismic waves emitted by earthquakes can be detected, recorded and analyzed. From this analysis, information can be obtained about the precise location of the earthquake (epicenter), its depth, released energy, the mechanism that generates the shock, and the means that the waves traveled to reach the place where they were generated until the sensor that detected them.

really dont know just need some points

answer: - few nutrients

high pressure

low temperatures

explanation: 1. few nutrients:   open-ocean zone is located way far from the land, which is the main source of the essential nutrients.2. high pressure: pressure increases by 1 atmosphere for every 10 meters increase in depth.3. ample sunlight: a large fraction of the sunlight is reflected back to the atmosphere from the sea surface. 4. varying salinity: below the thermocline, the water is isolated from the atmosphere so the salinity remains stable over the year.5. low temperatures:   the temperature of open-ocean zone ranges from a low of -2°c to an average of 17°c