Which of these is the best evidence that the Earth's crust has undergone
some major changes?
O a. The presence of marine fossils in
mountain rock
O b. The location of major rivers
O c The arrival of the vernal equinox
O d. The amount of available water on Earth

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.

Afootpath is to be constructed in a park in the shape of a parallelogram. when a coordinate plane is laid over a map of the park, the vertices of the footpath are (-4,2) (8,2) (11,7) and (-1,7). what is the perimeter of this path

The states that the process that have been occurring today have been occurring since earth formed. what is it?