When Earth and Mars are at their theoretically closest point of 54.6 million km, it would take a signal from Earth about 3 minutes to make the journey, and then another 3 minutes for the signals to get back to Earth.
Switchgrass is a hardy, deep-rooted, perennial rhizomatous grass that begins growth in late spring. It can grow up to 2.7 m high, but is typically shorter than big bluestem grass or indiangrass. The leaves are 30â90 cm long, with a prominent midrib.
Plant Life. Most of the plant life in the grasslands are grasses. They include Blue Grama, Buffalo grass, Big Blue stem, switch grass and Little Blue Stem just to name a few. The tall grasses will grow where rainfall is about 30 inches a year. The Big Blue stem and switch grass can grow 7 feet tall.