Question

Choose all the answers that apply.

Answer 1

Deltas and sand dunes form from erosion
 
a river carrying dirt into a lake is a example of water erosion

fossils can tell us about environments

when the oceanic and continental plate collide, the oceanic plate sinks below the continental plate

a footprint is a trace fossil 

Answer 2

Answer: (1) Folding, (2) Both formed by erosion, (3)Water containing chemicals dissolves the rock minerals. (4) Rapid burial,

(5) Deposited sediment, (6) Climate & environment,

(7) Oceanic plate subducts below a continental plate,

(8) Footprints of organisms.

Explanation:

• Mountains are formed due to the collision of two continental plates, which generates folding. For example, the Himalayas.
• Sand dunes as well as deltas are erosional features caused by the agents wind and water respectively.
• Water that are rich in chemical undergoes chemical reaction with the adjacent country rocks is an example of chemical erosion.
• In order to be a fossil, the first step is immediate burial of the dead remains and should not come in contact with Oxygen.
• Deltas are the region near the sea which are produced due to the accumulation of sediments.
• Palaeoclimatic condition and palaeo-environment can be determined from a fossil study.
• When an oceanic plate and  continental plate collides, the denser oceanic plate gets subducted under less dense continental plate.
• Foot prints, mold and cast are the common trace fossils.