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.

they have sperm in my gf's mouth

explanation:

estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.