Read the passage and select the ecosystem it describes.

i live in the most unforgiving of places. it almost never rains. here the cold, cold wind blows non-stop. the soil is frozen year-round, and it is of such poor quality that almost nothing grows. the few plants that do grow here seem to huddle together for warmth.

steppe
tundra
desert
forest

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.