Select the correct answer.
which description best explains how a doppler radar system works?
a.
it reflects waves off of objects, measuring the difference of the waves it sends and receives.
b.
it sends out a set of waves where each wave is preprogrammed to detect a certain kind of object.
c.
it uses an antenna to measure the angle between two or more objects in distant space.
d.
it uses the doppler effect to raise the pitch of sound waves so objects in distant space can be heard.

What is the name of the ocean current that affects the british isles? how does it influence their climate?

Match your vocabulary word to its definition. 1. emigration 2. immigration 3. migration 4. overpopulation 5. sustainable development 6. under population 7. unsustainable development 8. urbanization the movement from one place to another the number of people exceeds the available natural resources in an area leaving one's homeland to settle in a new place the increase in the population of a city the movement of people to a new country the ability to meet current needs without reducing the ability to meet future needs resources being used up at a faster rate than they can be replenished birth rate insufficient to replace the existing population

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