Astream that flows into another larger stream is called a
a. delta.
b. gradient.
c. meander.
d. tributary.

D. tributary

Explanation:
A stream that flows into a large stream is called a tributary.
The tributary meets the parent stream, named the mainstem, at a point called the confluence.

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

Sonar is an application of the doppler effect used by submarines.  this test was on k12.