A hydrothermal vent is a fissure in a planet's surface from which geothermally heated water issues. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins, and hotspots.
When to Set out Tomato Plants. The best time to set out tomato plants is after danger of frost, which is usually anytime in April, May or early June. If you started seed indoors, the seedlings should be about 6 to 8 inches tall and hardened off before transplanting outside.
Despite the fact that. tomatoes evolved in the tropics, flowering in tomato. is sensitive to temperature. When day temperatures. exceed 85Â°F and night temperatures exceed 72Â°F, tomato flowers will abort. An important factor. involved with temperature is time of exposure.