Why do scientists believe the universe is still expanding? a
The further away an object is, the higher the temperature and pressure eventually become, causing nuclear fusion
b
Distant objects shift in frequency toward red on the electromagnetic spectrum, which tells us objects are moving away from us
c
Spiral galaxies spin, so they appear to be a rotating disk of stars and dust
d
Distant objects shift in frequency toward blue on the electromagnetic spectrum, which tells us objects are closer to us us

What pattern of migration do whales follow?

Agroup of students is studying convection currents. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other in an area with warm air. after 10 minutes, the balloons are released from a height of 1 meter. which of the following do the students most likely observe? question 8 options: the cold balloon expands and rises. the warm balloon shrinks and sinks. the balloons rise at the same rate. both balloons are the same size. the ballons both rise. the cold ballon is larger than the warm balloon. the warm balloon expands and rises. the cold balloon shrinks and sinks.

How does the diagram explain ocean currents? earth tilt 23.5 degreesquestion 1 options: earth's tilt causes uneven heating of earth which causes currents.earth's tilt causes the ocean to move because of gravity.earth's tilt and its rotation cause currents.earth's tilt causes uneven distribution of salt which causes currents.