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.
Highest daytime temperature. When growing tomatoes in a greenhouse, daytime temperatures in the summer can be a problem, but temperatures cannot exceed 35 degrees Celsius (95 degrees Fahrenheit). If they do, you'll need to open the doors and ventilate to reduce the temperature.