Select four major types of landforms: i need an answer

1.mountains
2.allegheny
3.appalachians
4.cascades
5.cultural geography
6.plains
7.marianas trench
8.hills
9.polar projections
10.ponds
11.continental shelf
12.plateaus

Food can come from sustainable or unsustainable resources. why has the united nations suggested that bugs could be a better source of food than animals like pigs or cattle?

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

The formation of the planet uranus is estimated to have occurred approximately when?