True or false : rust is a product of mechanical weathering

False: Rust is a product of chemical weathering. Oxygen reacts with iron to form iron oxide (rust).

Mechanical weathering occurs when things are damaged physically like when ice makes a rock crack.

Chemical weathering is when things are disintigrated or damaged due to chemical reactions.

Hope this was helpful,

Bri

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.

correct answer is a. and d.