Describe an example of how necessity brings about technological change?

While examining the spectrum of a galaxy you find all the hydrogen lines are shifted to longer wavelengths. this galaxy is?

Why do tornadoes happen more frequently in the summer

Elephants exhibit herding behavior. when they travel, the oldest and largest members often travel on the outer edges of the group. why is this important to the survival of the species?

The distance from Earth of the red supergiant Betelgeuse is approximately 643 light-years. If it were to explode as a supernova, it would be one of the brightest stars in the sky.

resource nationalization is the term given to government control of a county natural resources true or false

Describe why a "permanent underclass" has developed in many cities, and the problems that result.

What is a disconformity? A. an intrusion that runs between rock layers B. an intrusion that cuts across another rock C. when a sedimentary rock is deposited on top of an eroded non-sedimentary rock D.

What is the action of unearthing something, especially at an archaeological site

What type of damages can you cause while driving

Which of these is an environmental consequence of the shrinking of the Aral Sea? A. The salt content of the water has increased. B. More nesting birds have come to its beaches. C. Fish populations have increased to unhealthy levels. D.