Will mark please put the meanings i have 10 mins left 1.Topography

2. Landforms

3.Mountains

4. Coastline

5. Dune

6. River

7. Delta

8. Surveying

9.Model

A river is ribbon like shape of water that flows downhill from the force of gravity. A body of water smaller than a river is often called a stream, creek, or pond.

A delta is a body of water that carries rushing water from rivers into lakes, oceans, etc.

Hope this helps!

Please mark brainliest!

d is the only accurate one

step-by-step explanation:

step by step resolutions

1) n+n+1+n+2=51

3n+3=51

3n=48

n=16

the three numbers are 16, 17 and 18.

2) x+15=4x

3x=15

x=5

radha is now 5 years old

3) the two digits are x and y.

y=3x

(10x+y)+(10y+x)=88

y=3x

11x+11y=88

y=3x

x+y=8

x+3x=8

x=2

the original number can be either 28 or 82.

4) n+(n+2)+(n+4)=48

3n+6=48

3n=42

n=14

the numbers are 14, 16 and 18.

5) y=x+3

10y+x+10x+y=143

y=x+3

11x+11y=143

y=x+3

x+y=13

x+x+3=13

2x=10

x=5

the original number can be 57 or 75.

hope this !