Astronaut

a person who travels in spacecraft

Boulder

a very large piece of  rock

Cliffs

a high area of rock with a very steep side, often on a coast

Delta

an area of low flat land, sometimes shaped approximately like a triangle, where a river divides

Estuary

the wide part of a river at the place where it joins the sea

Hieroglyph

a writing system using picture symbols; used in ancient Egypt

Inhabitant

a person or animal that lives in a particular place

Meandering

If a river, stream or road meanders, it follows a route which is not straight or direct

Mudflat           

a flat area of very wet soil near the sea which is covered at high tide

Pebble

a small smooth round stone, especially one found on a beach or in a river

Rapids

a dangerous part of a river which flows very fast because it is steep and sometimes narrow

Relic

an object (sometimes holy) from the past like tools and ornaments, etc.  

Scribe

in ancient Egyptian times a scribe was responsible for all design and drawing of images

Solar system

the sun and the group of planets which move around it