(a) They were likely carved by water flowing across the surface.
(b) They were probably formed by tectonic stresses when the crust shrank as the planet’s core cooled.
(c) They doubtlessly created by a series of large meteors that struck the surface in rapid succession.
(d) They are almost certainly volcanic in origin, shaped by lava flows.
(e) They are a great mystery, since no evidence has suggested a reasonable hypothesis for their formation.
An isolated black hole in space would be difficult to detect because…
(a) …there would be no light source nearby.
(b) …it would not be rotating rapidly.
(c) …it would be stationary.
(d) …very little matter would be falling into it.
(e) …there would be very few stars behind it whose light it could obscure.
What are asteroids?
(a) Tiny fragments of ice scattered around the Solar System.
(b) Small chunks of rock and dust scattered around the Solar System.
(c) Rocky objects, smaller than planets but much larger than buildings.
(d) Fragments of material that come to Earth from outer space.
(b) They were probably formed by tectonic stresses when the crust shrank as the planet’s core cooled.
(c) They doubtlessly created by a series of large meteors that struck the surface in rapid succession.
(d) They are almost certainly volcanic in origin, shaped by lava flows.
(e) They are a great mystery, since no evidence has suggested a reasonable hypothesis for their formation.
An isolated black hole in space would be difficult to detect because…
(a) …there would be no light source nearby.
(b) …it would not be rotating rapidly.
(c) …it would be stationary.
(d) …very little matter would be falling into it.
(e) …there would be very few stars behind it whose light it could obscure.
What are asteroids?
(a) Tiny fragments of ice scattered around the Solar System.
(b) Small chunks of rock and dust scattered around the Solar System.
(c) Rocky objects, smaller than planets but much larger than buildings.
(d) Fragments of material that come to Earth from outer space.