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.
Plant your tomato seedlings outdoors 1-2 weeks after the last frost date. Waiting longer to plant after the last frost date will reduce the chance of losing your tomato crop to freeze and will allow the ground to warm â which is the kind of environment in which tomatoes do best!Sample calculation.hen To Start Tomato Seeds. Start tomato seeds indoors or in a greenhouse (find greenhouse plans) before planting season. When spring comes, seedlings will be ready to plant outdoors.