Is a rift valley the same as a tectonic-formed estuary?

No. An estuary is "the tidal mouth of a large river, where the tide meets the stream" (definition provided by Google). I.e. the sea is involved. A rift valley need not involve the sea, though lakes will form - as in the East African Rift Valley. However, a rift valley could give rise to one or more estuaries. read more

An estuary is "the tidal mouth of a large river, where the tide meets the stream" (definition provided by Google). I.e. the sea is involved. A rift valley need not involve the sea, though lakes will form - as in the East African Rift Valley. read more

A rift valley is a linear-shapedlowland between several highlands or mountain ranges created by the action of ageologic rift or fault. A rift valley is formed on a divergent plate boundary,a crustal extension, a spreading apart of the surface, which is subsequentlyfurther deepened by the forces of erosion. read more

A _____ is characterized by two high tides and two low tides each tidal day, with both the high and low tides having approximately the same height. semidiural tidal pattern A _____ is characterized by a large inequality in high-water heights, low-water heights, or both. read more